56664215 has 4 divisors (see below), whose sum is σ = 67997064. Its totient is φ = 45331368.

The previous prime is 56664211. The next prime is 56664217. The reversal of 56664215 is 51246665.

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

It is a cyclic number.

It is not a de Polignac number, because 56664215 - 2² = 56664211 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56664211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5666417 + ... + 5666426.

It is an arithmetic number, because the mean of its divisors is an integer number (16999266).

Almost surely, 2^56664215 is an apocalyptic number.

56664215 is a deficient number, since it is larger than the sum of its proper divisors (11332849).

56664215 is a wasteful number, since it uses less digits than its factorization.

56664215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11332848.

The product of its digits is 43200, while the sum is 35.

The square root of 56664215 is about 7527.5636828924. The cubic root of 56664215 is about 384.0929114550.

The spelling of 56664215 in words is "fifty-six million, six hundred sixty-four thousand, two hundred fifteen".