78989898 has 16 divisors (see below), whose sum is σ = 170132256. Its totient is φ = 24304560.

The previous prime is 78989893. The next prime is 78989909. The reversal of 78989898 is 89898987.

78989898 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78989893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 506268 + ... + 506423.

It is an arithmetic number, because the mean of its divisors is an integer number (10633266).

Almost surely, 2^78989898 is an apocalyptic number.

78989898 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

78989898 is an abundant number, since it is smaller than the sum of its proper divisors (91142358).

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

78989898 is a wasteful number, since it uses less digits than its factorization.

78989898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1012709.

The product of its digits is 20901888, while the sum is 66.

The square root of 78989898 is about 8887.6261172486. The cubic root of 78989898 is about 429.0657524420.

The spelling of 78989898 in words is "seventy-eight million, nine hundred eighty-nine thousand, eight hundred ninety-eight".