78457712 has 20 divisors (see below), whose sum is σ = 154505736. Its totient is φ = 38585280.

The previous prime is 78457693. The next prime is 78457739. The reversal of 78457712 is 21775487.

It is a super-2 number, since 2×78457712² = 12311225144549888, which contains 22 as substring.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 78457712.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39218 + ... + 41169.

Almost surely, 2^78457712 is an apocalyptic number.

It is an amenable number.

78457712 is a deficient number, since it is larger than the sum of its proper divisors (76048024).

78457712 is a wasteful number, since it uses less digits than its factorization.

78457712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80456 (or 80450 counting only the distinct ones).

The product of its digits is 109760, while the sum is 41.

The square root of 78457712 is about 8857.6358019508. The cubic root of 78457712 is about 428.0999853749.

The spelling of 78457712 in words is "seventy-eight million, four hundred fifty-seven thousand, seven hundred twelve".