78986790 has 96 divisors (see below), whose sum is σ = 213497856. Its totient is φ = 20247360.

The previous prime is 78986779. The next prime is 78986797. The reversal of 78986790 is 9768987.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78986797) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 300199 + ... + 300461.

It is an arithmetic number, because the mean of its divisors is an integer number (2223936).

Almost surely, 2^78986790 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78986790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106748928).

78986790 is an abundant number, since it is smaller than the sum of its proper divisors (134511066).

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

78986790 is a wasteful number, since it uses less digits than its factorization.

78986790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394 (or 391 counting only the distinct ones).

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

The square root of 78986790 is about 8887.4512656892. The cubic root of 78986790 is about 429.0601249129.

The spelling of 78986790 in words is "seventy-eight million, nine hundred eighty-six thousand, seven hundred ninety".