78961980 has 24 divisors (see below), whose sum is σ = 221093712. Its totient is φ = 21056512.

The previous prime is 78961951. The next prime is 78962003. The reversal of 78961980 is 8916987.

It is a happy number.

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, 657957 + ... + 658076.

It is an arithmetic number, because the mean of its divisors is an integer number (9212238).

Almost surely, 2^78961980 is an apocalyptic number.

It is an amenable number.

78961980 is an abundant number, since it is smaller than the sum of its proper divisors (142131732).

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

78961980 is a wasteful number, since it uses less digits than its factorization.

78961980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1316045 (or 1316043 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 48.

The square root of 78961980 is about 8886.0553678221. The cubic root of 78961980 is about 429.0151971622.

The spelling of 78961980 in words is "seventy-eight million, nine hundred sixty-one thousand, nine hundred eighty".