87765863 has 4 divisors (see below), whose sum is σ = 89253480. Its totient is φ = 86278248.

The previous prime is 87765859. The next prime is 87765877. The reversal of 87765863 is 36856778.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 87765863 - 2² = 87765859 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 (87765893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 743720 + ... + 743837.

It is an arithmetic number, because the mean of its divisors is an integer number (22313370).

Almost surely, 2^87765863 is an apocalyptic number.

87765863 is a deficient number, since it is larger than the sum of its proper divisors (1487617).

87765863 is a wasteful number, since it uses less digits than its factorization.

87765863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1487616.

The product of its digits is 1693440, while the sum is 50.

The square root of 87765863 is about 9368.3436636366. The cubic root of 87765863 is about 444.4011858985.

The spelling of 87765863 in words is "eighty-seven million, seven hundred sixty-five thousand, eight hundred sixty-three".