78840786 has 32 divisors (see below), whose sum is σ = 164602368. Its totient is φ = 25151360.

The previous prime is 78840767. The next prime is 78840791. The reversal of 78840786 is 68704887.

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, 10015 + ... + 16061.

It is an arithmetic number, because the mean of its divisors is an integer number (5143824).

Almost surely, 2^78840786 is an apocalyptic number.

78840786 is an abundant number, since it is smaller than the sum of its proper divisors (85761582).

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

78840786 is a wasteful number, since it uses less digits than its factorization.

78840786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6146.

The product of its (nonzero) digits is 602112, while the sum is 48.

The square root of 78840786 is about 8879.2334128572. The cubic root of 78840786 is about 428.7955948870.

The spelling of 78840786 in words is "seventy-eight million, eight hundred forty thousand, seven hundred eighty-six".