51720060 has 48 divisors (see below), whose sum is σ = 165505536. Its totient is φ = 11821632.

The previous prime is 51720037. The next prime is 51720073. The reversal of 51720060 is 6002715.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61152 + ... + 61991.

It is an arithmetic number, because the mean of its divisors is an integer number (3448032).

Almost surely, 2^51720060 is an apocalyptic number.

It is an amenable number.

51720060 is an abundant number, since it is smaller than the sum of its proper divisors (113785476).

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

51720060 is a wasteful number, since it uses less digits than its factorization.

51720060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123162 (or 123160 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 51720060 is about 7191.6660100425. Note that the first 3 decimals coincide. The cubic root of 51720060 is about 372.5801157948.

Adding to 51720060 its reverse (6002715), we get a palindrome (57722775).

The spelling of 51720060 in words is "fifty-one million, seven hundred twenty thousand, sixty".