51620540 has 12 divisors (see below), whose sum is σ = 108403176. Its totient is φ = 20648208.

The previous prime is 51620531. The next prime is 51620567. The reversal of 51620540 is 4502615.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1290494 + ... + 1290533.

It is an arithmetic number, because the mean of its divisors is an integer number (9033598).

Almost surely, 2^51620540 is an apocalyptic number.

It is an amenable number.

51620540 is an abundant number, since it is smaller than the sum of its proper divisors (56782636).

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

51620540 is a wasteful number, since it uses less digits than its factorization.

51620540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2581036 (or 2581034 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 51620540 is about 7184.7435584021. The cubic root of 51620540 is about 372.3409888408.

The spelling of 51620540 in words is "fifty-one million, six hundred twenty thousand, five hundred forty".