78057312 has 24 divisors (see below), whose sum is σ = 204900696. Its totient is φ = 26019072.

The previous prime is 78057289. The next prime is 78057313. The reversal of 78057312 is 21375087.

It is a tau number, because it is divible by the number of its divisors (24).

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78057313) 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, 406453 + ... + 406644.

It is an arithmetic number, because the mean of its divisors is an integer number (8537529).

Almost surely, 2^78057312 is an apocalyptic number.

It is an amenable number.

78057312 is an abundant number, since it is smaller than the sum of its proper divisors (126843384).

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

78057312 is a wasteful number, since it uses less digits than its factorization.

78057312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 813110 (or 813102 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 33.

The square root of 78057312 is about 8835.0049235979. The cubic root of 78057312 is about 427.3704898208.

The spelling of 78057312 in words is "seventy-eight million, fifty-seven thousand, three hundred twelve".