51626540 has 48 divisors (see below), whose sum is σ = 124320000. Its totient is φ = 17641152.

The previous prime is 51626521. The next prime is 51626551. The reversal of 51626540 is 4562615.

It is a super-4 number, since 4×51626540⁴ (a number of 32 digits) contains 4444 as substring.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 69491 + ... + 70229.

It is an arithmetic number, because the mean of its divisors is an integer number (2590000).

Almost surely, 2^51626540 is an apocalyptic number.

It is an amenable number.

51626540 is an abundant number, since it is smaller than the sum of its proper divisors (72693460).

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

51626540 is a wasteful number, since it uses less digits than its factorization.

51626540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1254 (or 1252 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 51626540 is about 7185.1610977069. The cubic root of 51626540 is about 372.3554143607.

The spelling of 51626540 in words is "fifty-one million, six hundred twenty-six thousand, five hundred forty".