56781238 has 4 divisors (see below), whose sum is σ = 85171860. Its totient is φ = 28390618.

The previous prime is 56781229. The next prime is 56781259. The reversal of 56781238 is 83218765.

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

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 56781238.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14195308 + ... + 14195311.

It is an arithmetic number, because the mean of its divisors is an integer number (21292965).

Almost surely, 2^56781238 is an apocalyptic number.

56781238 is a deficient number, since it is larger than the sum of its proper divisors (28390622).

56781238 is a wasteful number, since it uses less digits than its factorization.

56781238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28390621.

The product of its digits is 80640, while the sum is 40.

The square root of 56781238 is about 7535.3326403020. The cubic root of 56781238 is about 384.3571393468.

The spelling of 56781238 in words is "fifty-six million, seven hundred eighty-one thousand, two hundred thirty-eight".