51157750 has 128 divisors (see below), whose sum is σ = 120766464. Its totient is φ = 15840000.

The previous prime is 51157739. The next prime is 51157751. The reversal of 51157750 is 5775115.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51157751) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1247730 + ... + 1247770.

It is an arithmetic number, because the mean of its divisors is an integer number (943488).

Almost surely, 2^51157750 is an apocalyptic number.

51157750 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51157750 is an abundant number, since it is smaller than the sum of its proper divisors (69608714).

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

51157750 is a wasteful number, since it uses less digits than its factorization.

51157750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119 (or 109 counting only the distinct ones).

The product of its (nonzero) digits is 6125, while the sum is 31.

The square root of 51157750 is about 7152.4646101886. The cubic root of 51157750 is about 371.2249394519.

The spelling of 51157750 in words is "fifty-one million, one hundred fifty-seven thousand, seven hundred fifty".