87640764 has 24 divisors (see below), whose sum is σ = 213386880. Its totient is φ = 27943344.

The previous prime is 87640723. The next prime is 87640793. The reversal of 87640764 is 46704678.

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, 158494 + ... + 159045.

It is an arithmetic number, because the mean of its divisors is an integer number (8891120).

Almost surely, 2^87640764 is an apocalyptic number.

It is an amenable number.

87640764 is an abundant number, since it is smaller than the sum of its proper divisors (125746116).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

87640764 is a wasteful number, since it uses less digits than its factorization.

87640764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317569 (or 317567 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 42.

The square root of 87640764 is about 9361.6645955727. The cubic root of 87640764 is about 444.1899398358.

The spelling of 87640764 in words is "eighty-seven million, six hundred forty thousand, seven hundred sixty-four".