87807961 has 4 divisors (see below), whose sum is σ = 87933924. Its totient is φ = 87682000.

The previous prime is 87807953. The next prime is 87807991. The reversal of 87807961 is 16970878.

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 34152336 + 53655625 = 5844^2 + 7325^2 .

It is a cyclic number.

It is not a de Polignac number, because 87807961 - 2³ = 87807953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87807991) 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, 61930 + ... + 63331.

It is an arithmetic number, because the mean of its divisors is an integer number (21983481).

Almost surely, 2^87807961 is an apocalyptic number.

It is an amenable number.

87807961 is a deficient number, since it is larger than the sum of its proper divisors (125963).

87807961 is a wasteful number, since it uses less digits than its factorization.

87807961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125962.

The product of its (nonzero) digits is 169344, while the sum is 46.

The square root of 87807961 is about 9370.5902162030. The cubic root of 87807961 is about 444.4722287468.

The spelling of 87807961 in words is "eighty-seven million, eight hundred seven thousand, nine hundred sixty-one".