78391168 has 32 divisors (see below), whose sum is σ = 156843360. Its totient is φ = 39026688.

The previous prime is 78391109. The next prime is 78391177. The reversal of 78391168 is 86119387.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×78391168² = 12290350440808448, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31705 + ... + 34087.

It is an arithmetic number, because the mean of its divisors is an integer number (4901355).

Almost surely, 2^78391168 is an apocalyptic number.

It is an amenable number.

78391168 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

78391168 is a wasteful number, since it uses less digits than its factorization.

78391168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2654 (or 2642 counting only the distinct ones).

The product of its digits is 72576, while the sum is 43.

The square root of 78391168 is about 8853.8786980622. The cubic root of 78391168 is about 427.9789199738.

The spelling of 78391168 in words is "seventy-eight million, three hundred ninety-one thousand, one hundred sixty-eight".