78577764 has 12 divisors (see below), whose sum is σ = 183348144. Its totient is φ = 26192584.

The previous prime is 78577721. The next prime is 78577781. The reversal of 78577764 is 46777587.

It is a tau number, because it is divible by the number of its divisors (12).

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, 3274062 + ... + 3274085.

It is an arithmetic number, because the mean of its divisors is an integer number (15279012).

Almost surely, 2^78577764 is an apocalyptic number.

It is an amenable number.

78577764 is an abundant number, since it is smaller than the sum of its proper divisors (104770380).

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

78577764 is a wasteful number, since it uses less digits than its factorization.

78577764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6548154 (or 6548152 counting only the distinct ones).

The product of its digits is 2304960, while the sum is 51.

The square root of 78577764 is about 8864.4099634437. The cubic root of 78577764 is about 428.3182263728.

The spelling of 78577764 in words is "seventy-eight million, five hundred seventy-seven thousand, seven hundred sixty-four".