56217138 has 16 divisors (see below), whose sum is σ = 116311680. Its totient is φ = 18092816.

The previous prime is 56217131. The next prime is 56217151. The reversal of 56217138 is 83171265.

It is a super-2 number, since 2×56217138² = 6320733209822088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 56217099 and 56217108.

It is not an unprimeable number, because it can be changed into a prime (56217131) 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, 161370 + ... + 161717.

It is an arithmetic number, because the mean of its divisors is an integer number (7269480).

Almost surely, 2^56217138 is an apocalyptic number.

56217138 is a gapful number since it is divisible by the number (58) formed by its first and last digit.

56217138 is an abundant number, since it is smaller than the sum of its proper divisors (60094542).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

56217138 is a wasteful number, since it uses less digits than its factorization.

56217138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323121.

The product of its digits is 10080, while the sum is 33.

The square root of 56217138 is about 7497.8088799329. The cubic root of 56217138 is about 383.0800869638.

The spelling of 56217138 in words is "fifty-six million, two hundred seventeen thousand, one hundred thirty-eight".