78799998 has 32 divisors (see below), whose sum is σ = 168544800. Its totient is φ = 24473600.

The previous prime is 78799997. The next prime is 78800017. The reversal of 78799998 is 89999787.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78799993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6478 + ... + 14126.

It is an arithmetic number, because the mean of its divisors is an integer number (5267025).

Almost surely, 2^78799998 is an apocalyptic number.

78799998 is an abundant number, since it is smaller than the sum of its proper divisors (89744802).

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

78799998 is a wasteful number, since it uses less digits than its factorization.

78799998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7772.

The product of its digits is 20575296, while the sum is 66.

The square root of 78799998 is about 8876.9362958174. The cubic root of 78799998 is about 428.7216368400.

It can be divided in two parts, 78799 and 998, that added together give a palindrome (79797).

The spelling of 78799998 in words is "seventy-eight million, seven hundred ninety-nine thousand, nine hundred ninety-eight".