87136477 has 4 divisors (see below), whose sum is σ = 87618076. Its totient is φ = 86654880.

The previous prime is 87136463. The next prime is 87136499. The reversal of 87136477 is 77463178.

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 25341156 + 61795321 = 5034^2 + 7861^2 .

It is a cyclic number.

It is not a de Polignac number, because 87136477 - 2⁷ = 87136349 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 (87136177) 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, 240528 + ... + 240889.

It is an arithmetic number, because the mean of its divisors is an integer number (21904519).

Almost surely, 2^87136477 is an apocalyptic number.

It is an amenable number.

87136477 is a deficient number, since it is larger than the sum of its proper divisors (481599).

87136477 is a wasteful number, since it uses less digits than its factorization.

87136477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481598.

The product of its digits is 197568, while the sum is 43.

The square root of 87136477 is about 9334.6921213289. The cubic root of 87136477 is about 443.3363407689.

The spelling of 87136477 in words is "eighty-seven million, one hundred thirty-six thousand, four hundred seventy-seven".