79781498 has 4 divisors (see below), whose sum is σ = 119672250. Its totient is φ = 39890748.

The previous prime is 79781497. The next prime is 79781501. The reversal of 79781498 is 89418797.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89418797 = 13 ⋅6878369.

It can be written as a sum of positive squares in only one way, i.e., 72880369 + 6901129 = 8537^2 + 2627^2 .

It is not an unprimeable number, because it can be changed into a prime (79781497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19945373 + ... + 19945376.

Almost surely, 2^79781498 is an apocalyptic number.

79781498 is a deficient number, since it is larger than the sum of its proper divisors (39890752).

79781498 is a wasteful number, since it uses less digits than its factorization.

79781498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39890751.

The product of its digits is 1016064, while the sum is 53.

The square root of 79781498 is about 8932.0489250787. The cubic root of 79781498 is about 430.4942900721.

The spelling of 79781498 in words is "seventy-nine million, seven hundred eighty-one thousand, four hundred ninety-eight".