87792561 has 6 divisors (see below), whose sum is σ = 126811490. Its totient is φ = 58528368.

The previous prime is 87792553. The next prime is 87792571. The reversal of 87792561 is 16529778.

87792561 is a `hidden beast` number, since 87 + 7 + 9 + 2 + 561 = 666.

It can be written as a sum of positive squares in only one way, i.e., 87778161 + 14400 = 9369^2 + 120^2 .

It is not a de Polignac number, because 87792561 - 2³ = 87792553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87792511) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4877356 + ... + 4877373.

Almost surely, 2^87792561 is an apocalyptic number.

It is an amenable number.

87792561 is a deficient number, since it is larger than the sum of its proper divisors (39018929).

87792561 is a wasteful number, since it uses less digits than its factorization.

87792561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9754735 (or 9754732 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 87792561 is about 9369.7684603196. The cubic root of 87792561 is about 444.4462429765.

The spelling of 87792561 in words is "eighty-seven million, seven hundred ninety-two thousand, five hundred sixty-one".