87165797 has 4 divisors (see below), whose sum is σ = 87201036. Its totient is φ = 87130560.

The previous prime is 87165779. The next prime is 87165811. The reversal of 87165797 is 79756178.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79756178 = 2 ⋅39878089.

It can be written as a sum of positive squares in 2 ways, for example, as 28398241 + 58767556 = 5329^2 + 7666^2 .

It is a cyclic number.

It is not a de Polignac number, because 87165797 - 2⁸ = 87165541 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 (87165497) 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, 13604 + ... + 18957.

It is an arithmetic number, because the mean of its divisors is an integer number (21800259).

Almost surely, 2^87165797 is an apocalyptic number.

It is an amenable number.

87165797 is a deficient number, since it is larger than the sum of its proper divisors (35239).

87165797 is a wasteful number, since it uses less digits than its factorization.

87165797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35238.

The product of its digits is 740880, while the sum is 50.

The square root of 87165797 is about 9336.2624748879. The cubic root of 87165797 is about 443.3860603364.

The spelling of 87165797 in words is "eighty-seven million, one hundred sixty-five thousand, seven hundred ninety-seven".