87642885 has 16 divisors (see below), whose sum is σ = 152976960. Its totient is φ = 42493440.

The previous prime is 87642883. The next prime is 87642887. The reversal of 87642885 is 58824678.

It is an interprime number because it is at equal distance from previous prime (87642883) and next prime (87642887).

It is not a de Polignac number, because 87642885 - 2¹ = 87642883 is a prime.

It is a super-2 number, since 2×87642885² = 15362550582246450, which contains 22 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 (87642883) 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, 265420 + ... + 265749.

It is an arithmetic number, because the mean of its divisors is an integer number (9561060).

Almost surely, 2^87642885 is an apocalyptic number.

It is an amenable number.

87642885 is a deficient number, since it is larger than the sum of its proper divisors (65334075).

87642885 is a wasteful number, since it uses less digits than its factorization.

87642885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531188.

The product of its digits is 860160, while the sum is 48.

The square root of 87642885 is about 9361.7778760233. Note that the first 3 decimals coincide. The cubic root of 87642885 is about 444.1935230970.

The spelling of 87642885 in words is "eighty-seven million, six hundred forty-two thousand, eight hundred eighty-five".