78989680 has 80 divisors (see below), whose sum is σ = 228985344. Its totient is φ = 24618240.

The previous prime is 78989653. The next prime is 78989737. The reversal of 78989680 is 8698987.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (55).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 252 + ... + 12571.

Almost surely, 2^78989680 is an apocalyptic number.

78989680 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78989680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114492672).

78989680 is an abundant number, since it is smaller than the sum of its proper divisors (149995664).

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

78989680 is a wasteful number, since it uses less digits than its factorization.

78989680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12854 (or 12848 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 55.

The square root of 78989680 is about 8887.6138529979. The cubic root of 78989680 is about 429.0653577231.

It can be divided in two parts, 7898 and 9680, that added together give a triangular number (17578 = T₁₈₇).

The spelling of 78989680 in words is "seventy-eight million, nine hundred eighty-nine thousand, six hundred eighty".