78899998 has 4 divisors (see below), whose sum is σ = 118350000. Its totient is φ = 39449998.

The previous prime is 78899993. The next prime is 78900001. The reversal of 78899998 is 89999887.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89999887 = 17 ⋅5294111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78899993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19724998 + ... + 19725001.

It is an arithmetic number, because the mean of its divisors is an integer number (29587500).

Almost surely, 2^78899998 is an apocalyptic number.

78899998 is a deficient number, since it is larger than the sum of its proper divisors (39450002).

78899998 is a wasteful number, since it uses less digits than its factorization.

78899998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39450001.

The product of its digits is 23514624, while the sum is 67.

The square root of 78899998 is about 8882.5670839009. The cubic root of 78899998 is about 428.9029145139.

It can be divided in two parts, 78899 and 998, that added together give a palindrome (79897).

The spelling of 78899998 in words is "seventy-eight million, eight hundred ninety-nine thousand, nine hundred ninety-eight".