78982640 has 40 divisors (see below), whose sum is σ = 200330928. Its totient is φ = 28720640.

The previous prime is 78982633. The next prime is 78982681. The reversal of 78982640 is 4628987.

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

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 78982591 and 78982600.

It is a congruent number.

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, 43997 + ... + 45756.

Almost surely, 2^78982640 is an apocalyptic number.

It is an amenable number.

78982640 is an abundant number, since it is smaller than the sum of its proper divisors (121348288).

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

78982640 is a wasteful number, since it uses less digits than its factorization.

78982640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89777 (or 89771 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 78982640 is about 8887.2177873618. The cubic root of 78982640 is about 429.0526104466.

The spelling of 78982640 in words is "seventy-eight million, nine hundred eighty-two thousand, six hundred forty".