78717980 has 24 divisors (see below), whose sum is σ = 180336240. Its totient is φ = 28624640.

The previous prime is 78717979. The next prime is 78718001. The reversal of 78717980 is 8971787.

It is a super-3 number, since 3×78717980³ (a number of 25 digits) contains 333 as substring.

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, 178685 + ... + 179124.

It is an arithmetic number, because the mean of its divisors is an integer number (7514010).

Almost surely, 2^78717980 is an apocalyptic number.

It is an amenable number.

78717980 is an abundant number, since it is smaller than the sum of its proper divisors (101618260).

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

78717980 is a wasteful number, since it uses less digits than its factorization.

78717980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357829 (or 357827 counting only the distinct ones).

The product of its (nonzero) digits is 197568, while the sum is 47.

The square root of 78717980 is about 8872.3153686059. The cubic root of 78717980 is about 428.5728420059.

It can be divided in two parts, 78717 and 980, that added together give a palindrome (79697).

The spelling of 78717980 in words is "seventy-eight million, seven hundred seventeen thousand, nine hundred eighty".