53997687 has 6 divisors (see below), whose sum is σ = 77996672. Its totient is φ = 35998452.

The previous prime is 53997667. The next prime is 53997707. The reversal of 53997687 is 78679935.

It is an interprime number because it is at equal distance from previous prime (53997667) and next prime (53997707).

It is not a de Polignac number, because 53997687 - 2²⁴ = 37220471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53997607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2999863 + ... + 2999880.

Almost surely, 2^53997687 is an apocalyptic number.

53997687 is a deficient number, since it is larger than the sum of its proper divisors (23998985).

53997687 is a wasteful number, since it uses less digits than its factorization.

53997687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5999749 (or 5999746 counting only the distinct ones).

The product of its digits is 2857680, while the sum is 54.

The square root of 53997687 is about 7348.3118469482. The cubic root of 53997687 is about 377.9709182296.

The spelling of 53997687 in words is "fifty-three million, nine hundred ninety-seven thousand, six hundred eighty-seven".