87307081 has 16 divisors (see below), whose sum is σ = 93597840. Its totient is φ = 81285120.

The previous prime is 87307069. The next prime is 87307117. The reversal of 87307081 is 18070378.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 4769856 + 82537225 = 2184^2 + 9085^2 .

It is a 4-Lehmer number, since φ(87307081) divides (87307081-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 87307081 - 2¹⁹ = 86782793 is a prime.

It is a super-2 number, since 2×87307081² = 15245052785481122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87307001) 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, 114955 + ... + 115711.

It is an arithmetic number, because the mean of its divisors is an integer number (5849865).

Almost surely, 2^87307081 is an apocalyptic number.

It is an amenable number.

87307081 is a deficient number, since it is larger than the sum of its proper divisors (6290759).

87307081 is a wasteful number, since it uses less digits than its factorization.

87307081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 924.

The product of its (nonzero) digits is 9408, while the sum is 34.

The square root of 87307081 is about 9343.8258224348. The cubic root of 87307081 is about 443.6254873566.

The spelling of 87307081 in words is "eighty-seven million, three hundred seven thousand, eighty-one".