79921045 has 8 divisors (see below), whose sum is σ = 95988024. Its totient is φ = 63881664.

The previous prime is 79921043. The next prime is 79921081. The reversal of 79921045 is 54012997.

It can be written as a sum of positive squares in 4 ways, for example, as 30724849 + 49196196 = 5543^2 + 7014^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 79921045 - 2¹ = 79921043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 79920995 and 79921013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79921043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127 + ... + 12643.

It is an arithmetic number, because the mean of its divisors is an integer number (11998503).

Almost surely, 2^79921045 is an apocalyptic number.

It is an amenable number.

79921045 is a deficient number, since it is larger than the sum of its proper divisors (16066979).

79921045 is a wasteful number, since it uses less digits than its factorization.

79921045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13799.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 79921045 is about 8939.8571017662. The cubic root of 79921045 is about 430.7451385213.

The spelling of 79921045 in words is "seventy-nine million, nine hundred twenty-one thousand, forty-five".