87640730 has 32 divisors (see below), whose sum is σ = 167736960. Its totient is φ = 32875200.

The previous prime is 87640723. The next prime is 87640793. The reversal of 87640730 is 3704678.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16907 + ... + 21473.

It is an arithmetic number, because the mean of its divisors is an integer number (5241780).

Almost surely, 2^87640730 is an apocalyptic number.

87640730 is a deficient number, since it is larger than the sum of its proper divisors (80096230).

87640730 is a wasteful number, since it uses less digits than its factorization.

87640730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4694.

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 87640730 is about 9361.6627796562. The cubic root of 87640730 is about 444.1898823950.

The spelling of 87640730 in words is "eighty-seven million, six hundred forty thousand, seven hundred thirty".