56400987 has 32 divisors (see below), whose sum is σ = 83174400. Its totient is φ = 33861888.

The previous prime is 56400983. The next prime is 56401001. The reversal of 56400987 is 78900465.

It is not a de Polignac number, because 56400987 - 2² = 56400983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56400983) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 98839 + ... + 99407.

It is an arithmetic number, because the mean of its divisors is an integer number (2599200).

Almost surely, 2^56400987 is an apocalyptic number.

56400987 is a gapful number since it is divisible by the number (57) formed by its first and last digit.

56400987 is a deficient number, since it is larger than the sum of its proper divisors (26773413).

56400987 is a wasteful number, since it uses less digits than its factorization.

56400987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 675.

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 56400987 is about 7510.0590543617. The cubic root of 56400987 is about 383.4972329160.

The spelling of 56400987 in words is "fifty-six million, four hundred thousand, nine hundred eighty-seven".