51779728 has 160 divisors (see below), whose sum is σ = 139491072. Its totient is φ = 17971200.

The previous prime is 51779711. The next prime is 51779729. The reversal of 51779728 is 82797715.

It is a super-2 number, since 2×51779728² = 5362280463507968, which contains 22 as substring.

Its product of digits (246960) is a multiple of the sum of its prime divisors (147).

It is not an unprimeable number, because it can be changed into a prime (51779729) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 848818 + ... + 848878.

Almost surely, 2^51779728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51779728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69745536).

51779728 is an abundant number, since it is smaller than the sum of its proper divisors (87711344).

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

51779728 is a wasteful number, since it uses less digits than its factorization.

51779728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153 (or 147 counting only the distinct ones).

The product of its digits is 246960, while the sum is 46.

The square root of 51779728 is about 7195.8132271481. The cubic root of 51779728 is about 372.7233391830.

The spelling of 51779728 in words is "fifty-one million, seven hundred seventy-nine thousand, seven hundred twenty-eight".