87640767 has 12 divisors (see below), whose sum is σ = 128376144. Its totient is φ = 57603840.

The previous prime is 87640723. The next prime is 87640793. The reversal of 87640767 is 76704678.

It is not a de Polignac number, because 87640767 - 2¹² = 87636671 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87640717) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 67938 + ... + 69215.

It is an arithmetic number, because the mean of its divisors is an integer number (10698012).

Almost surely, 2^87640767 is an apocalyptic number.

87640767 is a deficient number, since it is larger than the sum of its proper divisors (40735377).

87640767 is a wasteful number, since it uses less digits than its factorization.

87640767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137230 (or 137227 counting only the distinct ones).

The product of its (nonzero) digits is 395136, while the sum is 45.

The square root of 87640767 is about 9361.6647558006. The cubic root of 87640767 is about 444.1899449041.

The spelling of 87640767 in words is "eighty-seven million, six hundred forty thousand, seven hundred sixty-seven".