56138428 has 12 divisors (see below), whose sum is σ = 98558320. Its totient is φ = 27978912.

The previous prime is 56138413. The next prime is 56138443. The reversal of 56138428 is 82483165.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (56138413) and next prime (56138443).

It is a super-2 number, since 2×56138428² = 6303046196622368, which contains 22 as substring.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21168 + ... + 23671.

Almost surely, 2^56138428 is an apocalyptic number.

It is an amenable number.

56138428 is a deficient number, since it is larger than the sum of its proper divisors (42419892).

56138428 is a wasteful number, since it uses less digits than its factorization.

56138428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45156 (or 45154 counting only the distinct ones).

The product of its digits is 46080, while the sum is 37.

The square root of 56138428 is about 7492.5581746157. The cubic root of 56138428 is about 382.9012191085.

It can be divided in two parts, 5613 and 8428, that added together give a palindrome (14041).

The spelling of 56138428 in words is "fifty-six million, one hundred thirty-eight thousand, four hundred twenty-eight".