53665887 has 8 divisors (see below), whose sum is σ = 78059520. Its totient is φ = 32524760.

The previous prime is 53665883. The next prime is 53665901. The reversal of 53665887 is 78856635.

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 53665887 - 2² = 53665883 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53665883) 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, 813087 + ... + 813152.

It is an arithmetic number, because the mean of its divisors is an integer number (9757440).

Almost surely, 2^53665887 is an apocalyptic number.

53665887 is a deficient number, since it is larger than the sum of its proper divisors (24393633).

53665887 is a wasteful number, since it uses less digits than its factorization.

53665887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1626253.

The product of its digits is 1209600, while the sum is 48.

The square root of 53665887 is about 7325.7004443261. The cubic root of 53665887 is about 377.1951535074.

The spelling of 53665887 in words is "fifty-three million, six hundred sixty-five thousand, eight hundred eighty-seven".