86721680 has 40 divisors (see below), whose sum is σ = 202165632. Its totient is φ = 34596224.

The previous prime is 86721631. The next prime is 86721703. The reversal of 86721680 is 8612768.

It is a tau number, because it is divible by the number of its divisors (40).

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, 34217 + ... + 36663.

Almost surely, 2^86721680 is an apocalyptic number.

86721680 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

86721680 is an abundant number, since it is smaller than the sum of its proper divisors (115443952).

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

86721680 is a wasteful number, since it uses less digits than its factorization.

86721680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2903 (or 2897 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 86721680 is about 9312.4475837451. The cubic root of 86721680 is about 442.6317481448.

The spelling of 86721680 in words is "eighty-six million, seven hundred twenty-one thousand, six hundred eighty".