79621858 has 4 divisors (see below), whose sum is σ = 119432790. Its totient is φ = 39810928.

The previous prime is 79621831. The next prime is 79621859. The reversal of 79621858 is 85812697.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 62457409 + 17164449 = 7903^2 + 4143^2 .

It is not an unprimeable number, because it can be changed into a prime (79621859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19905463 + ... + 19905466.

Almost surely, 2^79621858 is an apocalyptic number.

79621858 is a deficient number, since it is larger than the sum of its proper divisors (39810932).

79621858 is a wasteful number, since it uses less digits than its factorization.

79621858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39810931.

The product of its digits is 241920, while the sum is 46.

The square root of 79621858 is about 8923.1080907944. The cubic root of 79621858 is about 430.2069636476.

The spelling of 79621858 in words is "seventy-nine million, six hundred twenty-one thousand, eight hundred fifty-eight".