1555424640 has 768 divisors, whose sum is σ = 7032614400. Its totient is φ = 321269760.

The previous prime is 1555424579. The next prime is 1555424677. The reversal of 1555424640 is 464245551.

1555424640 is a `hidden beast` number, since 1 + 5 + 5 + 5 + 4 + 2 + 4 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1555424595 and 1555424604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 9313837 + ... + 9314003.

It is an arithmetic number, because the mean of its divisors is an integer number (9157050).

Almost surely, 2^1555424640 is an apocalyptic number.

1555424640 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 1555424640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3516307200).

1555424640 is an abundant number, since it is smaller than the sum of its proper divisors (5477189760).

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

1555424640 is a wasteful number, since it uses less digits than its factorization.

1555424640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220 (or 195 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 36.

The square root of 1555424640 is about 39438.8721948283. The cubic root of 1555424640 is about 1158.6430426722.

Subtracting from 1555424640 its reverse (464245551), we obtain a square (1091179089 = 33033²).

The spelling of 1555424640 in words is "one billion, five hundred fifty-five million, four hundred twenty-four thousand, six hundred forty".