87864642 has 16 divisors (see below), whose sum is σ = 195254880. Its totient is φ = 29288196.

The previous prime is 87864641. The next prime is 87864659. The reversal of 87864642 is 24646878.

It is not an unprimeable number, because it can be changed into a prime (87864641) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 813508 + ... + 813615.

It is an arithmetic number, because the mean of its divisors is an integer number (12203430).

Almost surely, 2^87864642 is an apocalyptic number.

87864642 is an abundant number, since it is smaller than the sum of its proper divisors (107390238).

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

87864642 is a wasteful number, since it uses less digits than its factorization.

87864642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1627134 (or 1627128 counting only the distinct ones).

The product of its digits is 516096, while the sum is 45.

The square root of 87864642 is about 9373.6141375672. The cubic root of 87864642 is about 444.5678454056.

The spelling of 87864642 in words is "eighty-seven million, eight hundred sixty-four thousand, six hundred forty-two".