78897572398 has 4 divisors (see below), whose sum is σ = 118346358600. Its totient is φ = 39448786198.

The previous prime is 78897572389. The next prime is 78897572401. The reversal of 78897572398 is 89327579887.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 78897572398.

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 as a sum of consecutive naturals, namely, 19724393098 + ... + 19724393101.

It is an arithmetic number, because the mean of its divisors is an integer number (29586589650).

Almost surely, 2^78897572398 is an apocalyptic number.

78897572398 is a deficient number, since it is larger than the sum of its proper divisors (39448786202).

78897572398 is a wasteful number, since it uses less digits than its factorization.

78897572398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39448786201.

The product of its digits is 426746880, while the sum is 73.

The spelling of 78897572398 in words is "seventy-eight billion, eight hundred ninety-seven million, five hundred seventy-two thousand, three hundred ninety-eight".