53557987 has 8 divisors (see below), whose sum is σ = 63183872. Its totient is φ = 44425800.

The previous prime is 53557963. The next prime is 53557993. The reversal of 53557987 is 78975535.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 53557987 - 2²³ = 45169379 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 53557987.

It is not an unprimeable number, because it can be changed into a prime (53557937) 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, 123189 + ... + 123622.

It is an arithmetic number, because the mean of its divisors is an integer number (7897984).

Almost surely, 2^53557987 is an apocalyptic number.

53557987 is a deficient number, since it is larger than the sum of its proper divisors (9625885).

53557987 is a wasteful number, since it uses less digits than its factorization.

53557987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246849.

The product of its digits is 1323000, while the sum is 49.

The square root of 53557987 is about 7318.3322553708. The cubic root of 53557987 is about 376.9421891856.

The spelling of 53557987 in words is "fifty-three million, five hundred fifty-seven thousand, nine hundred eighty-seven".