56851987 has 8 divisors (see below), whose sum is σ = 58909680. Its totient is φ = 54830880.

The previous prime is 56851981. The next prime is 56851997. The reversal of 56851987 is 78915865.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56851987 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 56851987.

It is not an unprimeable number, because it can be changed into a prime (56851981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5964 + ... + 12217.

It is an arithmetic number, because the mean of its divisors is an integer number (7363710).

Almost surely, 2^56851987 is an apocalyptic number.

56851987 is a deficient number, since it is larger than the sum of its proper divisors (2057693).

56851987 is a wasteful number, since it uses less digits than its factorization.

56851987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18293.

The product of its digits is 604800, while the sum is 49.

The square root of 56851987 is about 7540.0256630863. The cubic root of 56851987 is about 384.5167084696.

The spelling of 56851987 in words is "fifty-six million, eight hundred fifty-one thousand, nine hundred eighty-seven".