56821238 has 4 divisors (see below), whose sum is σ = 85231860. Its totient is φ = 28410618.

The previous prime is 56821231. The next prime is 56821273. The reversal of 56821238 is 83212865.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83212865 = 5 ⋅16642573.

It is a junction number, because it is equal to n+sod(n) for n = 56821198 and 56821207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56821231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14205308 + ... + 14205311.

It is an arithmetic number, because the mean of its divisors is an integer number (21307965).

Almost surely, 2^56821238 is an apocalyptic number.

56821238 is a deficient number, since it is larger than the sum of its proper divisors (28410622).

56821238 is a wasteful number, since it uses less digits than its factorization.

56821238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28410621.

The product of its digits is 23040, while the sum is 35.

The square root of 56821238 is about 7537.9863358857. The cubic root of 56821238 is about 384.4473726548.

The spelling of 56821238 in words is "fifty-six million, eight hundred twenty-one thousand, two hundred thirty-eight".