78783980 has 24 divisors (see below), whose sum is σ = 180487440. Its totient is φ = 28648640.

The previous prime is 78783977. The next prime is 78783983. The reversal of 78783980 is 8938787.

It is an interprime number because it is at equal distance from previous prime (78783977) and next prime (78783983).

It is not an unprimeable number, because it can be changed into a prime (78783983) 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, 178835 + ... + 179274.

It is an arithmetic number, because the mean of its divisors is an integer number (7520310).

Almost surely, 2^78783980 is an apocalyptic number.

It is an amenable number.

78783980 is an abundant number, since it is smaller than the sum of its proper divisors (101703460).

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

78783980 is a wasteful number, since it uses less digits than its factorization.

78783980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358129 (or 358127 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 50.

The square root of 78783980 is about 8876.0340242701. The cubic root of 78783980 is about 428.6925855341.

The spelling of 78783980 in words is "seventy-eight million, seven hundred eighty-three thousand, nine hundred eighty".