51657072 has 40 divisors (see below), whose sum is σ = 133939344. Its totient is φ = 17155584.

The previous prime is 51657071. The next prime is 51657119. The reversal of 51657072 is 27075615.

It is a super-2 number, since 2×51657072² = 5336906175226368, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51657071) by changing a digit.

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, 12228 + ... + 15900.

Almost surely, 2^51657072 is an apocalyptic number.

It is an amenable number.

51657072 is an abundant number, since it is smaller than the sum of its proper divisors (82282272).

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

51657072 is a wasteful number, since it uses less digits than its factorization.

51657072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3977 (or 3971 counting only the distinct ones).

The product of its (nonzero) digits is 14700, while the sum is 33.

The square root of 51657072 is about 7187.2854402758. The cubic root of 51657072 is about 372.4288037136.

The spelling of 51657072 in words is "fifty-one million, six hundred fifty-seven thousand, seventy-two".