87915861 has 40 divisors (see below), whose sum is σ = 145200000. Its totient is φ = 52565760.

The previous prime is 87915833. The next prime is 87915881. The reversal of 87915861 is 16851978.

It is not a de Polignac number, because 87915861 - 2²¹ = 85818709 is a prime.

It is a super-3 number, since 3×87915861³ (a number of 25 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87915881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 69765 + ... + 71013.

It is an arithmetic number, because the mean of its divisors is an integer number (3630000).

Almost surely, 2^87915861 is an apocalyptic number.

87915861 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

87915861 is a deficient number, since it is larger than the sum of its proper divisors (57284139).

87915861 is a wasteful number, since it uses less digits than its factorization.

87915861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1351 (or 1342 counting only the distinct ones).

The product of its digits is 120960, while the sum is 45.

The square root of 87915861 is about 9376.3458234005. The cubic root of 87915861 is about 444.6542127121.

The spelling of 87915861 in words is "eighty-seven million, nine hundred fifteen thousand, eight hundred sixty-one".