56428689 has 8 divisors (see below), whose sum is σ = 79198240. Its totient is φ = 35639136.

The previous prime is 56428681. The next prime is 56428709. The reversal of 56428689 is 98682465.

It is a happy number.

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

It is not a de Polignac number, because 56428689 - 2³ = 56428681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56428681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 494932 + ... + 495045.

It is an arithmetic number, because the mean of its divisors is an integer number (9899780).

Almost surely, 2^56428689 is an apocalyptic number.

It is an amenable number.

56428689 is a deficient number, since it is larger than the sum of its proper divisors (22769551).

56428689 is a wasteful number, since it uses less digits than its factorization.

56428689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 989999.

The product of its digits is 829440, while the sum is 48.

The square root of 56428689 is about 7511.9031543278. The cubic root of 56428689 is about 383.5600090131.

The spelling of 56428689 in words is "fifty-six million, four hundred twenty-eight thousand, six hundred eighty-nine".