87297665 has 24 divisors (see below), whose sum is σ = 131239080. Its totient is φ = 55254528.

The previous prime is 87297619. The next prime is 87297677. The reversal of 87297665 is 56679278.

It can be written as a sum of positive squares in 4 ways, for example, as 2436721 + 84860944 = 1561^2 + 9212^2 .

It is not a de Polignac number, because 87297665 - 2¹⁶ = 87232129 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10520 + ... + 16889.

It is an arithmetic number, because the mean of its divisors is an integer number (5468295).

Almost surely, 2^87297665 is an apocalyptic number.

It is an amenable number.

87297665 is a deficient number, since it is larger than the sum of its proper divisors (43941415).

87297665 is a wasteful number, since it uses less digits than its factorization.

87297665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27441 (or 27434 counting only the distinct ones).

The product of its digits is 1270080, while the sum is 50.

The square root of 87297665 is about 9343.3219467168. The cubic root of 87297665 is about 443.6095385633.

The spelling of 87297665 in words is "eighty-seven million, two hundred ninety-seven thousand, six hundred sixty-five".