87197765 has 16 divisors (see below), whose sum is σ = 107433216. Its totient is φ = 67905600.

The previous prime is 87197749. The next prime is 87197767. The reversal of 87197765 is 56779178.

It is not a de Polignac number, because 87197765 - 2⁴ = 87197749 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 (87197767) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92195 + ... + 93135.

It is an arithmetic number, because the mean of its divisors is an integer number (6714576).

Almost surely, 2^87197765 is an apocalyptic number.

It is an amenable number.

87197765 is a deficient number, since it is larger than the sum of its proper divisors (20235451).

87197765 is a wasteful number, since it uses less digits than its factorization.

87197765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1420.

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

The square root of 87197765 is about 9337.9743520744. The cubic root of 87197765 is about 443.4402575622.

The spelling of 87197765 in words is "eighty-seven million, one hundred ninety-seven thousand, seven hundred sixty-five".