56421587 has 4 divisors (see below), whose sum is σ = 56444520. Its totient is φ = 56398656.

The previous prime is 56421577. The next prime is 56421593. The reversal of 56421587 is 78512465.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 56421587 - 2⁸ = 56421331 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 56421587.

It is not an unprimeable number, because it can be changed into a prime (56421557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7262 + ... + 12867.

It is an arithmetic number, because the mean of its divisors is an integer number (14111130).

Almost surely, 2^56421587 is an apocalyptic number.

56421587 is a deficient number, since it is larger than the sum of its proper divisors (22933).

56421587 is a wasteful number, since it uses less digits than its factorization.

56421587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22932.

The product of its digits is 67200, while the sum is 38.

The square root of 56421587 is about 7511.4304230286. The cubic root of 56421587 is about 383.5439169772.

The spelling of 56421587 in words is "fifty-six million, four hundred twenty-one thousand, five hundred eighty-seven".