87061581 has 16 divisors (see below), whose sum is σ = 129470400. Its totient is φ = 57820464.

The previous prime is 87061529. The next prime is 87061613. The reversal of 87061581 is 18516078.

87061581 is a `hidden beast` number, since 8 + 70 + 6 + 1 + 581 = 666.

It is not a de Polignac number, because 87061581 - 2⁷ = 87061453 is a prime.

It is a super-2 number, since 2×87061581² = 15159437772439122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87062581) 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, 1270 + ... + 13256.

It is an arithmetic number, because the mean of its divisors is an integer number (8091900).

Almost surely, 2^87061581 is an apocalyptic number.

It is an amenable number.

87061581 is a deficient number, since it is larger than the sum of its proper divisors (42408819).

87061581 is a wasteful number, since it uses less digits than its factorization.

87061581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12265 (or 12259 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 36.

The square root of 87061581 is about 9330.6795572455. The cubic root of 87061581 is about 443.2092847700.

The spelling of 87061581 in words is "eighty-seven million, sixty-one thousand, five hundred eighty-one".