51157740 has 48 divisors (see below), whose sum is σ = 148186080. Its totient is φ = 13171200.

The previous prime is 51157739. The next prime is 51157751. The reversal of 51157740 is 4775115.

51157740 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×51157740² = 5234228723815200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 51157698 and 51157707.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12961 + ... + 16440.

It is an arithmetic number, because the mean of its divisors is an integer number (3087210).

Almost surely, 2^51157740 is an apocalyptic number.

It is an amenable number.

51157740 is an abundant number, since it is smaller than the sum of its proper divisors (97028340).

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

51157740 is a wasteful number, since it uses less digits than its factorization.

51157740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29442 (or 29440 counting only the distinct ones).

The product of its (nonzero) digits is 4900, while the sum is 30.

The square root of 51157740 is about 7152.4639111288. The cubic root of 51157740 is about 371.2249152637.

The spelling of 51157740 in words is "fifty-one million, one hundred fifty-seven thousand, seven hundred forty".