51698772 has 36 divisors (see below), whose sum is σ = 137562880. Its totient is φ = 16325712.

The previous prime is 51698749. The next prime is 51698789. The reversal of 51698772 is 27789615.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37108 + ... + 38475.

Almost surely, 2^51698772 is an apocalyptic number.

It is an amenable number.

51698772 is an abundant number, since it is smaller than the sum of its proper divisors (85864108).

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

51698772 is a wasteful number, since it uses less digits than its factorization.

51698772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75612 (or 75607 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 51698772 is about 7190.1858112291. The cubic root of 51698772 is about 372.5289907320.

The spelling of 51698772 in words is "fifty-one million, six hundred ninety-eight thousand, seven hundred seventy-two".