53696640 has 64 divisors (see below), whose sum is σ = 171164160. Its totient is φ = 14318592.

The previous prime is 53696639. The next prime is 53696647. The reversal of 53696640 is 4669635.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (53696647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12064 + ... + 15903.

It is an arithmetic number, because the mean of its divisors is an integer number (2674440).

Almost surely, 2^53696640 is an apocalyptic number.

It is an amenable number.

53696640 is an abundant number, since it is smaller than the sum of its proper divisors (117467520).

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

53696640 is a wasteful number, since it uses less digits than its factorization.

53696640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27989 (or 27977 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 39.

The square root of 53696640 is about 7327.7991238843. The cubic root of 53696640 is about 377.2671897558.

The spelling of 53696640 in words is "fifty-three million, six hundred ninety-six thousand, six hundred forty".