78459741978 has 16 divisors (see below), whose sum is σ = 159069066816. Its totient is φ = 25794983520.

The previous prime is 78459741931. The next prime is 78459741991. The reversal of 78459741978 is 87914795487.

It is a super-2 number, since 2×78459741978² (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 7 ways as a sum of consecutive naturals, for example, 89565478 + ... + 89566353.

It is an arithmetic number, because the mean of its divisors is an integer number (9941816676).

Almost surely, 2^78459741978 is an apocalyptic number.

78459741978 is an abundant number, since it is smaller than the sum of its proper divisors (80609324838).

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

78459741978 is a wasteful number, since it uses less digits than its factorization.

78459741978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179131909.

The product of its digits is 142248960, while the sum is 69.

The spelling of 78459741978 in words is "seventy-eight billion, four hundred fifty-nine million, seven hundred forty-one thousand, nine hundred seventy-eight".