78914778 has 16 divisors (see below), whose sum is σ = 162921216. Its totient is φ = 25456320.

The previous prime is 78914777. The next prime is 78914813. The reversal of 78914778 is 87741987.

It is a self number, because there is not a number n which added to its sum of digits gives 78914778.

It is not an unprimeable number, because it can be changed into a prime (78914777) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 211951 + ... + 212322.

It is an arithmetic number, because the mean of its divisors is an integer number (10182576).

Almost surely, 2^78914778 is an apocalyptic number.

78914778 is an abundant number, since it is smaller than the sum of its proper divisors (84006438).

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

78914778 is a wasteful number, since it uses less digits than its factorization.

78914778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424309.

The product of its digits is 790272, while the sum is 51.

The square root of 78914778 is about 8883.3990116396. The cubic root of 78914778 is about 428.9296943595.

The spelling of 78914778 in words is "seventy-eight million, nine hundred fourteen thousand, seven hundred seventy-eight".