53665620 has 24 divisors (see below), whose sum is σ = 150263904. Its totient is φ = 14310816.

The previous prime is 53665613. The next prime is 53665637. The reversal of 53665620 is 2656635.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 447154 + ... + 447273.

It is an arithmetic number, because the mean of its divisors is an integer number (6260996).

Almost surely, 2^53665620 is an apocalyptic number.

It is an amenable number.

53665620 is an abundant number, since it is smaller than the sum of its proper divisors (96598284).

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

53665620 is a wasteful number, since it uses less digits than its factorization.

53665620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 894439 (or 894437 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 33.

The square root of 53665620 is about 7325.6822207901. The cubic root of 53665620 is about 377.1945279624.

It can be divided in two parts, 53665 and 620, that added together give a triangular number (54285 = T₃₂₉).

The spelling of 53665620 in words is "fifty-three million, six hundred sixty-five thousand, six hundred twenty".