53561816 has 32 divisors (see below), whose sum is σ = 125210880. Its totient is φ = 20868000.

The previous prime is 53561803. The next prime is 53561821. The reversal of 53561816 is 61816535.

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, 42860 + ... + 44091.

It is an arithmetic number, because the mean of its divisors is an integer number (3912840).

Almost surely, 2^53561816 is an apocalyptic number.

53561816 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

53561816 is an abundant number, since it is smaller than the sum of its proper divisors (71649064).

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

53561816 is a wasteful number, since it uses less digits than its factorization.

53561816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86975 (or 86971 counting only the distinct ones).

The product of its digits is 21600, while the sum is 35.

The square root of 53561816 is about 7318.5938540132. The cubic root of 53561816 is about 376.9511718312.

The spelling of 53561816 in words is "fifty-three million, five hundred sixty-one thousand, eight hundred sixteen".