78797766 has 8 divisors (see below), whose sum is σ = 157595544. Its totient is φ = 26265920.

The previous prime is 78797743. The next prime is 78797779. The reversal of 78797766 is 66779787.

It is a sphenic number, since it is the product of 3 distinct primes.

78797766 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6566475 + ... + 6566486.

It is an arithmetic number, because the mean of its divisors is an integer number (19699443).

Almost surely, 2^78797766 is an apocalyptic number.

78797766 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

78797766 is a wasteful number, since it uses less digits than its factorization.

78797766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13132966.

The product of its digits is 6223392, while the sum is 57.

The square root of 78797766 is about 8876.8105758769. The cubic root of 78797766 is about 428.7175889730.

The spelling of 78797766 in words is "seventy-eight million, seven hundred ninety-seven thousand, seven hundred sixty-six".