87021670 has 16 divisors (see below), whose sum is σ = 157874688. Its totient is φ = 34534080.

The previous prime is 87021667. The next prime is 87021731. The reversal of 87021670 is 7612078.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32991 + ... + 35530.

It is an arithmetic number, because the mean of its divisors is an integer number (9867168).

Almost surely, 2^87021670 is an apocalyptic number.

87021670 is a deficient number, since it is larger than the sum of its proper divisors (70853018).

87021670 is a wasteful number, since it uses less digits than its factorization.

87021670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68655.

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 87021670 is about 9328.5406146942. The cubic root of 87021670 is about 443.1415486946.

The spelling of 87021670 in words is "eighty-seven million, twenty-one thousand, six hundred seventy".