87765431 has 8 divisors (see below), whose sum is σ = 94612560. Its totient is φ = 80932032.

The previous prime is 87765421. The next prime is 87765437. The reversal of 87765431 is 13456778.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87765431 is a prime.

It is a super-2 number, since 2×87765431² = 15405541757231522, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87765437) 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, 12680 + ... + 18338.

It is an arithmetic number, because the mean of its divisors is an integer number (11826570).

Almost surely, 2^87765431 is an apocalyptic number.

87765431 is a deficient number, since it is larger than the sum of its proper divisors (6847129).

87765431 is a wasteful number, since it uses less digits than its factorization.

87765431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6865.

The product of its digits is 141120, while the sum is 41.

The square root of 87765431 is about 9368.3206072380. The cubic root of 87765431 is about 444.4004567554.

The spelling of 87765431 in words is "eighty-seven million, seven hundred sixty-five thousand, four hundred thirty-one".