53505387 has 64 divisors (see below), whose sum is σ = 91929600. Its totient is φ = 30481920.

The previous prime is 53505379. The next prime is 53505433. The reversal of 53505387 is 78350535.

It is not a de Polignac number, because 53505387 - 2³ = 53505379 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (53505187) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 473443 + ... + 473555.

It is an arithmetic number, because the mean of its divisors is an integer number (1436400).

Almost surely, 2^53505387 is an apocalyptic number.

53505387 is a gapful number since it is divisible by the number (57) formed by its first and last digit.

53505387 is a deficient number, since it is larger than the sum of its proper divisors (38424213).

53505387 is a wasteful number, since it uses less digits than its factorization.

53505387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225 (or 219 counting only the distinct ones).

The product of its (nonzero) digits is 63000, while the sum is 36.

The square root of 53505387 is about 7314.7376576334. The cubic root of 53505387 is about 376.8187488135.

The spelling of 53505387 in words is "fifty-three million, five hundred five thousand, three hundred eighty-seven".