78663680 has 104 divisors (see below), whose sum is σ = 198156672. Its totient is φ = 29917184.

The previous prime is 78663679. The next prime is 78663691. The reversal of 78663680 is 8636687.

It is a super-2 number, since 2×78663680² = 12375949102284800, which contains 22 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, 470957 + ... + 471123.

Almost surely, 2^78663680 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 78663680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99078336).

78663680 is an abundant number, since it is smaller than the sum of its proper divisors (119492992).

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

78663680 is a wasteful number, since it uses less digits than its factorization.

78663680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219 (or 197 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 78663680 is about 8869.2547601250. The cubic root of 78663680 is about 428.4742755441.

The spelling of 78663680 in words is "seventy-eight million, six hundred sixty-three thousand, six hundred eighty".