78786736 has 80 divisors (see below), whose sum is σ = 182845440. Its totient is φ = 32175360.

The previous prime is 78786733. The next prime is 78786737. The reversal of 78786736 is 63768787.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (78786733) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 412401 + ... + 412591.

It is an arithmetic number, because the mean of its divisors is an integer number (2285568).

Almost surely, 2^78786736 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 78786736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91422720).

78786736 is an abundant number, since it is smaller than the sum of its proper divisors (104058704).

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

78786736 is a wasteful number, since it uses less digits than its factorization.

78786736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362 (or 356 counting only the distinct ones).

The product of its digits is 2370816, while the sum is 52.

The square root of 78786736 is about 8876.1892724299. The cubic root of 78786736 is about 428.6975842787.

The spelling of 78786736 in words is "seventy-eight million, seven hundred eighty-six thousand, seven hundred thirty-six".