79991542 has 8 divisors (see below), whose sum is σ = 120163032. Its totient is φ = 39937200.

The previous prime is 79991531. The next prime is 79991591. The reversal of 79991542 is 24519997.

It is a happy number.

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 = 79991492 and 79991501.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27559 + ... + 30322.

It is an arithmetic number, because the mean of its divisors is an integer number (15020379).

Almost surely, 2^79991542 is an apocalyptic number.

79991542 is a deficient number, since it is larger than the sum of its proper divisors (40171490).

79991542 is a wasteful number, since it uses less digits than its factorization.

79991542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58574.

The product of its digits is 204120, while the sum is 46.

The square root of 79991542 is about 8943.7990809275. The cubic root of 79991542 is about 430.8717522974.

The spelling of 79991542 in words is "seventy-nine million, nine hundred ninety-one thousand, five hundred forty-two".