78311264 has 24 divisors (see below), whose sum is σ = 154385280. Its totient is φ = 39102336.

The previous prime is 78311257. The next prime is 78311269. The reversal of 78311264 is 46211387.

It is a super-2 number, since 2×78311264² = 12265308138555392, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 78311264.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78311269) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33857 + ... + 36095.

It is an arithmetic number, because the mean of its divisors is an integer number (6432720).

Almost surely, 2^78311264 is an apocalyptic number.

It is an amenable number.

78311264 is a deficient number, since it is larger than the sum of its proper divisors (76074016).

78311264 is a wasteful number, since it uses less digits than its factorization.

78311264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3342 (or 3334 counting only the distinct ones).

The product of its digits is 8064, while the sum is 32.

The square root of 78311264 is about 8849.3651749716. The cubic root of 78311264 is about 427.8334577823.

The spelling of 78311264 in words is "seventy-eight million, three hundred eleven thousand, two hundred sixty-four".