78397667998 has 16 divisors (see below), whose sum is σ = 131009366880. Its totient is φ = 34935830496.

The previous prime is 78397667989. The next prime is 78397668001. The reversal of 78397667998 is 89976679387.

It is a super-2 number, since 2×78397667998² (a number of 23 digits) 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 (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51987090 + ... + 51988597.

It is an arithmetic number, because the mean of its divisors is an integer number (8188085430).

Almost surely, 2^78397667998 is an apocalyptic number.

78397667998 is a deficient number, since it is larger than the sum of its proper divisors (52611698882).

78397667998 is a wasteful number, since it uses less digits than its factorization.

78397667998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103975731.

The product of its digits is 1728324864, while the sum is 79.

The spelling of 78397667998 in words is "seventy-eight billion, three hundred ninety-seven million, six hundred sixty-seven thousand, nine hundred ninety-eight".