78694980 has 288 divisors, whose sum is σ = 289578240. Its totient is φ = 15805440.

The previous prime is 78694939. The next prime is 78695003. The reversal of 78694980 is 8949687.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1108345 + ... + 1108415.

It is an arithmetic number, because the mean of its divisors is an integer number (1005480).

Almost surely, 2^78694980 is an apocalyptic number.

78694980 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 78694980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144789120).

78694980 is an abundant number, since it is smaller than the sum of its proper divisors (210883260).

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

78694980 is a wasteful number, since it uses less digits than its factorization.

78694980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139 (or 130 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 51.

The square root of 78694980 is about 8871.0191071827. The cubic root of 78694980 is about 428.5310974746.

The spelling of 78694980 in words is "seventy-eight million, six hundred ninety-four thousand, nine hundred eighty".