78899698 has 4 divisors (see below), whose sum is σ = 118349550. Its totient is φ = 39449848.

The previous prime is 78899687. The next prime is 78899701. The reversal of 78899698 is 89699887.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89699887 = 967 ⋅92761.

It can be written as a sum of positive squares in only one way, i.e., 40793769 + 38105929 = 6387^2 + 6173^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19724923 + ... + 19724926.

Almost surely, 2^78899698 is an apocalyptic number.

78899698 is a deficient number, since it is larger than the sum of its proper divisors (39449852).

78899698 is a wasteful number, since it uses less digits than its factorization.

78899698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39449851.

The product of its digits is 15676416, while the sum is 64.

The square root of 78899698 is about 8882.5501968748. The cubic root of 78899698 is about 428.9023709100.

It can be divided in two parts, 78899 and 698, that added together give a palindrome (79597).

The spelling of 78899698 in words is "seventy-eight million, eight hundred ninety-nine thousand, six hundred ninety-eight".