51397660 has 24 divisors (see below), whose sum is σ = 113616720. Its totient is φ = 19476864.

The previous prime is 51397639. The next prime is 51397669. The reversal of 51397660 is 6679315.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51397669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67249 + ... + 68008.

It is an arithmetic number, because the mean of its divisors is an integer number (4734030).

Almost surely, 2^51397660 is an apocalyptic number.

It is an amenable number.

51397660 is an abundant number, since it is smaller than the sum of its proper divisors (62219060).

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

51397660 is a wasteful number, since it uses less digits than its factorization.

51397660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135285 (or 135283 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 37.

The square root of 51397660 is about 7169.2161356734. The cubic root of 51397660 is about 371.8043349946.

The spelling of 51397660 in words is "fifty-one million, three hundred ninety-seven thousand, six hundred sixty".