78891380 has 96 divisors (see below), whose sum is σ = 182891520. Its totient is φ = 28497920.

The previous prime is 78891377. The next prime is 78891409. The reversal of 78891380 is 8319887.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 886376 + ... + 886464.

It is an arithmetic number, because the mean of its divisors is an integer number (1905120).

Almost surely, 2^78891380 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 78891380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91445760).

78891380 is an abundant number, since it is smaller than the sum of its proper divisors (104000140).

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

78891380 is a wasteful number, since it uses less digits than its factorization.

78891380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209 (or 207 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 44.

The square root of 78891380 is about 8882.0819631436. The cubic root of 78891380 is about 428.8872980374.

The spelling of 78891380 in words is "seventy-eight million, eight hundred ninety-one thousand, three hundred eighty".