87678972 has 18 divisors (see below), whose sum is σ = 221633048. Its totient is φ = 29226312.

The previous prime is 87678971. The next prime is 87678991. The reversal of 87678972 is 27987678.

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87678971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1217728 + ... + 1217799.

Almost surely, 2^87678972 is an apocalyptic number.

It is an amenable number.

87678972 is an abundant number, since it is smaller than the sum of its proper divisors (133954076).

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

87678972 is a wasteful number, since it uses less digits than its factorization.

87678972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2435537 (or 2435532 counting only the distinct ones).

The product of its digits is 2370816, while the sum is 54.

The square root of 87678972 is about 9363.7050359353. The cubic root of 87678972 is about 444.2544803636.

The spelling of 87678972 in words is "eighty-seven million, six hundred seventy-eight thousand, nine hundred seventy-two".