53691978 has 16 divisors (see below), whose sum is σ = 107579520. Its totient is φ = 17864736.

The previous prime is 53691977. The next prime is 53691997. The reversal of 53691978 is 87919635.

It is not an unprimeable number, because it can be changed into a prime (53691971) 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, 4450 + ... + 11277.

It is an arithmetic number, because the mean of its divisors is an integer number (6723720).

Almost surely, 2^53691978 is an apocalyptic number.

53691978 is an abundant number, since it is smaller than the sum of its proper divisors (53887542).

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

53691978 is a wasteful number, since it uses less digits than its factorization.

53691978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16301.

The product of its digits is 408240, while the sum is 48.

The square root of 53691978 is about 7327.4810132814. The cubic root of 53691978 is about 377.2562711922.

The spelling of 53691978 in words is "fifty-three million, six hundred ninety-one thousand, nine hundred seventy-eight".