51729984 has 42 divisors (see below), whose sum is σ = 148276310. Its totient is φ = 17243136.

The previous prime is 51729973. The next prime is 51729991. The reversal of 51729984 is 48992715.

It can be written as a sum of positive squares in only one way, i.e., 50808384 + 921600 = 7128^2 + 960^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 44329 + ... + 45480.

Almost surely, 2^51729984 is an apocalyptic number.

It is an amenable number.

51729984 is an abundant number, since it is smaller than the sum of its proper divisors (96546326).

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

51729984 is a wasteful number, since it uses less digits than its factorization.

51729984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89827 (or 89814 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 51729984 is about 7192.3559422487. The cubic root of 51729984 is about 372.6039443867.

The spelling of 51729984 in words is "fifty-one million, seven hundred twenty-nine thousand, nine hundred eighty-four".