51609564 has 36 divisors (see below), whose sum is σ = 132410824. Its totient is φ = 16945632.

The previous prime is 51609541. The next prime is 51609617. The reversal of 51609564 is 46590615.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8287 + ... + 13110.

Almost surely, 2^51609564 is an apocalyptic number.

It is an amenable number.

51609564 is an abundant number, since it is smaller than the sum of its proper divisors (80801260).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51609564 is a wasteful number, since it uses less digits than its factorization.

51609564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21474 (or 21469 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 51609564 is about 7183.9796770314. The cubic root of 51609564 is about 372.3145968634.

The spelling of 51609564 in words is "fifty-one million, six hundred nine thousand, five hundred sixty-four".