79808642 has 8 divisors (see below), whose sum is σ = 126754956. Its totient is φ = 37556992.

The previous prime is 79808639. The next prime is 79808647. The reversal of 79808642 is 24680897.

It can be written as a sum of positive squares in 2 ways, for example, as 59459521 + 20349121 = 7711^2 + 4511^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 79808593 and 79808602.

It is not an unprimeable number, because it can be changed into a prime (79808647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1173623 + ... + 1173690.

Almost surely, 2^79808642 is an apocalyptic number.

79808642 is a deficient number, since it is larger than the sum of its proper divisors (46946314).

79808642 is a wasteful number, since it uses less digits than its factorization.

79808642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2347332.

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 79808642 is about 8933.5682680550. The cubic root of 79808642 is about 430.5431067874.

The spelling of 79808642 in words is "seventy-nine million, eight hundred eight thousand, six hundred forty-two".