78645774 has 16 divisors (see below), whose sum is σ = 166544208. Its totient is φ = 24673152.

The previous prime is 78645733. The next prime is 78645779. The reversal of 78645774 is 47754687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78645779) 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, 385417 + ... + 385620.

It is an arithmetic number, because the mean of its divisors is an integer number (10409013).

Almost surely, 2^78645774 is an apocalyptic number.

78645774 is an abundant number, since it is smaller than the sum of its proper divisors (87898434).

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

78645774 is a wasteful number, since it uses less digits than its factorization.

78645774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771059.

The product of its digits is 1317120, while the sum is 48.

The square root of 78645774 is about 8868.2452604785. The cubic root of 78645774 is about 428.4417622649.

The spelling of 78645774 in words is "seventy-eight million, six hundred forty-five thousand, seven hundred seventy-four".