51605856 has 48 divisors (see below), whose sum is σ = 150519600. Its totient is φ = 17201664.

The previous prime is 51605833. The next prime is 51605909. The reversal of 51605856 is 65850615.

It is a tau number, because it is divible by the number of its divisors (48).

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

It is a self number, because there is not a number n which added to its sum of digits gives 51605856.

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 7 ways as a sum of consecutive naturals, for example, 29001 + ... + 30728.

It is an arithmetic number, because the mean of its divisors is an integer number (3135825).

Almost surely, 2^51605856 is an apocalyptic number.

It is an amenable number.

51605856 is an abundant number, since it is smaller than the sum of its proper divisors (98913744).

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

51605856 is a wasteful number, since it uses less digits than its factorization.

51605856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59748 (or 59734 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

The square root of 51605856 is about 7183.7215981690. The cubic root of 51605856 is about 372.3056800691.

The spelling of 51605856 in words is "fifty-one million, six hundred five thousand, eight hundred fifty-six".