87791615 has 8 divisors (see below), whose sum is σ = 106154928. Its totient is φ = 69696640.

The previous prime is 87791603. The next prime is 87791617. The reversal of 87791615 is 51619778.

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

It is not a de Polignac number, because 87791615 - 2²⁴ = 71014399 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 (87791617) 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, 66362 + ... + 67671.

It is an arithmetic number, because the mean of its divisors is an integer number (13269366).

Almost surely, 2^87791615 is an apocalyptic number.

87791615 is a deficient number, since it is larger than the sum of its proper divisors (18363313).

87791615 is a wasteful number, since it uses less digits than its factorization.

87791615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134169.

The product of its digits is 105840, while the sum is 44.

The square root of 87791615 is about 9369.7179786800. The cubic root of 87791615 is about 444.4446466087. Note that the first 3 decimals are identical.

The spelling of 87791615 in words is "eighty-seven million, seven hundred ninety-one thousand, six hundred fifteen".