78456516 has 12 divisors (see below), whose sum is σ = 183065232. Its totient is φ = 26152168.

The previous prime is 78456509. The next prime is 78456517. The reversal of 78456516 is 61565487.

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

It is not an unprimeable number, because it can be changed into a prime (78456517) 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, 3269010 + ... + 3269033.

It is an arithmetic number, because the mean of its divisors is an integer number (15255436).

Almost surely, 2^78456516 is an apocalyptic number.

It is an amenable number.

78456516 is an abundant number, since it is smaller than the sum of its proper divisors (104608716).

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

78456516 is a wasteful number, since it uses less digits than its factorization.

78456516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6538050 (or 6538048 counting only the distinct ones).

The product of its digits is 201600, while the sum is 42.

The square root of 78456516 is about 8857.5682893218. The cubic root of 78456516 is about 428.0978100622.

The spelling of 78456516 in words is "seventy-eight million, four hundred fifty-six thousand, five hundred sixteen".