51657375 has 64 divisors (see below), whose sum is σ = 107228160. Its totient is φ = 21456000.

The previous prime is 51657329. The next prime is 51657383. The reversal of 51657375 is 57375615.

It is a happy number.

It is not a de Polignac number, because 51657375 - 2⁶ = 51657311 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 27981 + ... + 29769.

It is an arithmetic number, because the mean of its divisors is an integer number (1675440).

Almost surely, 2^51657375 is an apocalyptic number.

51657375 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51657375 is an abundant number, since it is smaller than the sum of its proper divisors (55570785).

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

51657375 is a wasteful number, since it uses less digits than its factorization.

51657375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1825 (or 1815 counting only the distinct ones).

The product of its digits is 110250, while the sum is 39.

The square root of 51657375 is about 7187.3065191350. The cubic root of 51657375 is about 372.4295318856.

The spelling of 51657375 in words is "fifty-one million, six hundred fifty-seven thousand, three hundred seventy-five".