53991880 has 48 divisors (see below), whose sum is σ = 125421660. Its totient is φ = 20903040.

The previous prime is 53991877. The next prime is 53991919. The reversal of 53991880 is 8819935.

It can be written as a sum of positive squares in 2 ways, for example, as 52678564 + 1313316 = 7258^2 + 1146^2 .

It is a Smith number, since the sum of its digits (43) 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 in 11 ways as a sum of consecutive naturals, for example, 282585 + ... + 282775.

Almost surely, 2^53991880 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 53991880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62710830).

53991880 is an abundant number, since it is smaller than the sum of its proper divisors (71429780).

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

53991880 is a wasteful number, since it uses less digits than its factorization.

53991880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430 (or 235 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 53991880 is about 7347.9167115585. The cubic root of 53991880 is about 377.9573685393.

The spelling of 53991880 in words is "fifty-three million, nine hundred ninety-one thousand, eight hundred eighty".