78112049778 has 48 divisors (see below), whose sum is σ = 193466145600. Its totient is φ = 22312440288.

The previous prime is 78112049761. The next prime is 78112049783. The reversal of 78112049778 is 87794021187.

78112049778 is a `hidden beast` number, since 7 + 81 + 1 + 2 + 0 + 497 + 78 = 666.

It is a super-2 number, since 2×78112049778² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 476701 + ... + 619247.

It is an arithmetic number, because the mean of its divisors is an integer number (4030544700).

Almost surely, 2^78112049778 is an apocalyptic number.

78112049778 is an abundant number, since it is smaller than the sum of its proper divisors (115354095822).

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

78112049778 is a wasteful number, since it uses less digits than its factorization.

78112049778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146911 (or 146908 counting only the distinct ones).

The product of its (nonzero) digits is 1580544, while the sum is 54.

The spelling of 78112049778 in words is "seventy-eight billion, one hundred twelve million, forty-nine thousand, seven hundred seventy-eight".