79640273 has 2 divisors, whose sum is σ = 79640274. Its totient is φ = 79640272.

The previous prime is 79640263. The next prime is 79640339. The reversal of 79640273 is 37204697.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60341824 + 19298449 = 7768^2 + 4393^2 .

It is a cyclic number.

It is not a de Polignac number, because 79640273 - 2²² = 75445969 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (79640263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39820136 + 39820137.

It is an arithmetic number, because the mean of its divisors is an integer number (39820137).

Almost surely, 2^79640273 is an apocalyptic number.

It is an amenable number.

79640273 is a deficient number, since it is larger than the sum of its proper divisors (1).

79640273 is an equidigital number, since it uses as much as digits as its factorization.

79640273 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63504, while the sum is 38.

The square root of 79640273 is about 8924.1399025340. The cubic root of 79640273 is about 430.2401272820.

The spelling of 79640273 in words is "seventy-nine million, six hundred forty thousand, two hundred seventy-three".