78678672 has 40 divisors (see below), whose sum is σ = 208215840. Its totient is φ = 25585920.

The previous prime is 78678667. The next prime is 78678673. The reversal of 78678672 is 27687687.

It is not an unprimeable number, because it can be changed into a prime (78678673) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18022 + ... + 21957.

It is an arithmetic number, because the mean of its divisors is an integer number (5205396).

Almost surely, 2^78678672 is an apocalyptic number.

It is an amenable number.

78678672 is an abundant number, since it is smaller than the sum of its proper divisors (129537168).

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

78678672 is a wasteful number, since it uses less digits than its factorization.

78678672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40031 (or 40025 counting only the distinct ones).

The product of its digits is 1580544, while the sum is 51.

The square root of 78678672 is about 8870.0998866980. The cubic root of 78678672 is about 428.5014938584.

The spelling of 78678672 in words is "seventy-eight million, six hundred seventy-eight thousand, six hundred seventy-two".