53665408 has 16 divisors (see below), whose sum is σ = 106911810. Its totient is φ = 26832640.

The previous prime is 53665373. The next prime is 53665427. The reversal of 53665408 is 80456635.

It can be written as a sum of positive squares in only one way, i.e., 41886784 + 11778624 = 6472^2 + 3432^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 209503 + ... + 209758.

Almost surely, 2^53665408 is an apocalyptic number.

It is an amenable number.

53665408 is a deficient number, since it is larger than the sum of its proper divisors (53246402).

53665408 is an equidigital number, since it uses as much as digits as its factorization.

53665408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419275 (or 419263 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 37.

The square root of 53665408 is about 7325.6677511337. The cubic root of 53665408 is about 377.1940312736.

The spelling of 53665408 in words is "fifty-three million, six hundred sixty-five thousand, four hundred eight".