78197779098 has 96 divisors (see below), whose sum is σ = 174307970304. Its totient is φ = 25324240896.

The previous prime is 78197779081. The next prime is 78197779109. The reversal of 78197779098 is 89097779187.

It is a super-2 number, since 2×78197779098² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 99361461 + ... + 99362247.

It is an arithmetic number, because the mean of its divisors is an integer number (1815708024).

Almost surely, 2^78197779098 is an apocalyptic number.

78197779098 is an abundant number, since it is smaller than the sum of its proper divisors (96110191206).

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

78197779098 is a wasteful number, since it uses less digits than its factorization.

78197779098 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1556 (or 1553 counting only the distinct ones).

The product of its (nonzero) digits is 112021056, while the sum is 72.

The spelling of 78197779098 in words is "seventy-eight billion, one hundred ninety-seven million, seven hundred seventy-nine thousand, ninety-eight".