1555448640 has 112 divisors (see below), whose sum is σ = 5108935680. Its totient is φ = 400476160.

The previous prime is 1555448633. The next prime is 1555448647. The reversal of 1555448640 is 468445551.

It is an interprime number because it is at equal distance from previous prime (1555448633) and next prime (1555448647).

It is a super-3 number, since 3×1555448640³ (a number of 29 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1555448592 and 1555448601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1555448647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96 + ... + 55775.

Almost surely, 2^1555448640 is an apocalyptic number.

1555448640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1555448640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2554467840).

1555448640 is an abundant number, since it is smaller than the sum of its proper divisors (3553487040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1555448640 is a wasteful number, since it uses less digits than its factorization.

1555448640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55920 (or 55910 counting only the distinct ones).

The product of its (nonzero) digits is 384000, while the sum is 42.

The square root of 1555448640 is about 39439.1764619902. The cubic root of 1555448640 is about 1158.6490018787.

The spelling of 1555448640 in words is "one billion, five hundred fifty-five million, four hundred forty-eight thousand, six hundred forty".