1551880640 has 56 divisors (see below), whose sum is σ = 3795320832. Its totient is φ = 603970560.

The previous prime is 1551880609. The next prime is 1551880697. The reversal of 1551880640 is 460881551.

It is a junction number, because it is equal to n+sod(n) for n = 1551880594 and 1551880603.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53696 + ... + 77375.

Almost surely, 2^1551880640 is an apocalyptic number.

1551880640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1551880640 is an abundant number, since it is smaller than the sum of its proper divisors (2243440192).

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

1551880640 is a wasteful number, since it uses less digits than its factorization.

1551880640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131125 (or 131115 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 38.

The square root of 1551880640 is about 39393.9162815783. The cubic root of 1551880640 is about 1157.7623927963.

The spelling of 1551880640 in words is "one billion, five hundred fifty-one million, eight hundred eighty thousand, six hundred forty".