78997680 has 200 divisors, whose sum is σ = 279794592. Its totient is φ = 20653056.

The previous prime is 78997669. The next prime is 78997697. The reversal of 78997680 is 8679987.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 472957 + ... + 473123.

Almost surely, 2^78997680 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78997680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (139897296).

78997680 is an abundant number, since it is smaller than the sum of its proper divisors (200796912).

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

78997680 is a wasteful number, since it uses less digits than its factorization.

78997680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265 (or 250 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 54.

The square root of 78997680 is about 8888.0639061609. The cubic root of 78997680 is about 429.0798423451.

The spelling of 78997680 in words is "seventy-eight million, nine hundred ninety-seven thousand, six hundred eighty".