79307820 has 72 divisors (see below), whose sum is σ = 241297056. Its totient is φ = 21084672.

The previous prime is 79307803. The next prime is 79307821. The reversal of 79307820 is 2870397.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (79307821) 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 23 ways as a sum of consecutive naturals, for example, 106369 + ... + 107111.

It is an arithmetic number, because the mean of its divisors is an integer number (3351348).

Almost surely, 2^79307820 is an apocalyptic number.

It is an amenable number.

79307820 is an abundant number, since it is smaller than the sum of its proper divisors (161989236).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

79307820 is a wasteful number, since it uses less digits than its factorization.

79307820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1351 (or 1346 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 79307820 is about 8905.4938100029. The cubic root of 79307820 is about 429.6406227516.

The spelling of 79307820 in words is "seventy-nine million, three hundred seven thousand, eight hundred twenty".