87042681 has 60 divisors (see below), whose sum is σ = 145995696. Its totient is φ = 51630480.

The previous prime is 87042661. The next prime is 87042689. The reversal of 87042681 is 18624078.

It is not a de Polignac number, because 87042681 - 2⁶ = 87042617 is a prime.

It is a super-2 number, since 2×87042681² = 15152856631335522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (87042689) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 813430 + ... + 813536.

Almost surely, 2^87042681 is an apocalyptic number.

87042681 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

87042681 is a deficient number, since it is larger than the sum of its proper divisors (58953015).

87042681 is a wasteful number, since it uses less digits than its factorization.

87042681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224 (or 204 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 87042681 is about 9329.6667143044. Note that the first 3 decimals coincide. The cubic root of 87042681 is about 443.1772106848.

The spelling of 87042681 in words is "eighty-seven million, forty-two thousand, six hundred eighty-one".