87970177 has 4 divisors (see below), whose sum is σ = 88189956. Its totient is φ = 87750400.

The previous prime is 87970111. The next prime is 87970231. The reversal of 87970177 is 77107978.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 68574961 + 19395216 = 8281^2 + 4404^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87970177 is a prime.

It is a super-2 number, since 2×87970177² = 15477504082822658, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87970277) 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, 109288 + ... + 110089.

It is an arithmetic number, because the mean of its divisors is an integer number (22047489).

Almost surely, 2^87970177 is an apocalyptic number.

It is an amenable number.

87970177 is a deficient number, since it is larger than the sum of its proper divisors (219779).

87970177 is a wasteful number, since it uses less digits than its factorization.

87970177 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219778.

The product of its (nonzero) digits is 172872, while the sum is 46.

The square root of 87970177 is about 9379.2418137075. The cubic root of 87970177 is about 444.7457656501.

The spelling of 87970177 in words is "eighty-seven million, nine hundred seventy thousand, one hundred seventy-seven".