56690042 has 4 divisors (see below), whose sum is σ = 85035066. Its totient is φ = 28345020.

The previous prime is 56690033. The next prime is 56690047. The reversal of 56690042 is 24009665.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24009665 = 5 ⋅4801933.

It can be written as a sum of positive squares in only one way, i.e., 35058241 + 21631801 = 5921^2 + 4651^2 .

It is a junction number, because it is equal to n+sod(n) for n = 56689990 and 56690008.

It is not an unprimeable number, because it can be changed into a prime (56690047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14172509 + ... + 14172512.

Almost surely, 2^56690042 is an apocalyptic number.

56690042 is a deficient number, since it is larger than the sum of its proper divisors (28345024).

56690042 is a wasteful number, since it uses less digits than its factorization.

56690042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28345023.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 56690042 is about 7529.2789827446. The cubic root of 56690042 is about 384.1512578667.

The spelling of 56690042 in words is "fifty-six million, six hundred ninety thousand, forty-two".