78163776 has 42 divisors (see below), whose sum is σ = 224044002. Its totient is φ = 26054400.

The previous prime is 78163769. The next prime is 78163781. The reversal of 78163776 is 67736187.

It is a happy number.

78163776 is a `hidden beast` number, since 7 + 8 + 1 + 637 + 7 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 55353600 + 22810176 = 7440^2 + 4776^2 .

It is a super-2 number, since 2×78163776² = 12219151757156352, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67275 + ... + 68426.

It is an arithmetic number, because the mean of its divisors is an integer number (5334381).

Almost surely, 2^78163776 is an apocalyptic number.

It is an amenable number.

78163776 is an abundant number, since it is smaller than the sum of its proper divisors (145880226).

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

78163776 is a wasteful number, since it uses less digits than its factorization.

78163776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135719 (or 135706 counting only the distinct ones).

The product of its digits is 296352, while the sum is 45.

The square root of 78163776 is about 8841.0279945264. The cubic root of 78163776 is about 427.5647014002.

The spelling of 78163776 in words is "seventy-eight million, one hundred sixty-three thousand, seven hundred seventy-six".