79742817 has 48 divisors (see below), whose sum is σ = 149879808. Its totient is φ = 39615840.

The previous prime is 79742813. The next prime is 79742851. The reversal of 79742817 is 71824797.

It is a happy number.

It is not a de Polignac number, because 79742817 - 2² = 79742813 is a prime.

It is not an unprimeable number, because it can be changed into a prime (79742813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13438 + ... + 18440.

It is an arithmetic number, because the mean of its divisors is an integer number (3122496).

Almost surely, 2^79742817 is an apocalyptic number.

79742817 is a gapful number since it is divisible by the number (77) formed by its first and last digit.

It is an amenable number.

79742817 is a deficient number, since it is larger than the sum of its proper divisors (70136991).

79742817 is a wasteful number, since it uses less digits than its factorization.

79742817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5050 (or 5047 counting only the distinct ones).

The product of its digits is 197568, while the sum is 45.

The square root of 79742817 is about 8929.8833698991. The cubic root of 79742817 is about 430.4247056783.

The spelling of 79742817 in words is "seventy-nine million, seven hundred forty-two thousand, eight hundred seventeen".