51564694 has 8 divisors (see below), whose sum is σ = 77516208. Its totient is φ = 25725960.

The previous prime is 51564683. The next prime is 51564701. The reversal of 51564694 is 49646515.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

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, 27042 + ... + 28885.

It is an arithmetic number, because the mean of its divisors is an integer number (9689526).

Almost surely, 2^51564694 is an apocalyptic number.

51564694 is a deficient number, since it is larger than the sum of its proper divisors (25951514).

51564694 is a wasteful number, since it uses less digits than its factorization.

51564694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56390.

The product of its digits is 129600, while the sum is 40.

The square root of 51564694 is about 7180.8560770983. The cubic root of 51564694 is about 372.2066672575.

The spelling of 51564694 in words is "fifty-one million, five hundred sixty-four thousand, six hundred ninety-four".