51840657 has 24 divisors (see below), whose sum is σ = 81956160. Its totient is φ = 31315680.

The previous prime is 51840637. The next prime is 51840673. The reversal of 51840657 is 75604815.

It is not a de Polignac number, because 51840657 - 2¹¹ = 51838609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51840617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38644 + ... + 39962.

It is an arithmetic number, because the mean of its divisors is an integer number (3414840).

Almost surely, 2^51840657 is an apocalyptic number.

It is an amenable number.

51840657 is a deficient number, since it is larger than the sum of its proper divisors (30115503).

51840657 is a wasteful number, since it uses less digits than its factorization.

51840657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1733 (or 1730 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The square root of 51840657 is about 7200.0456248554. The cubic root of 51840657 is about 372.8694759021.

The spelling of 51840657 in words is "fifty-one million, eight hundred forty thousand, six hundred fifty-seven".