79820677 has 2 divisors, whose sum is σ = 79820678. Its totient is φ = 79820676.

The previous prime is 79820659. The next prime is 79820681. The reversal of 79820677 is 77602897.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79727041 + 93636 = 8929^2 + 306^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79820677 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79820177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39910338 + 39910339.

It is an arithmetic number, because the mean of its divisors is an integer number (39910339).

Almost surely, 2^79820677 is an apocalyptic number.

It is an amenable number.

79820677 is a deficient number, since it is larger than the sum of its proper divisors (1).

79820677 is an equidigital number, since it uses as much as digits as its factorization.

79820677 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 296352, while the sum is 46.

The square root of 79820677 is about 8934.2418256951. The cubic root of 79820677 is about 430.5647474090.

The spelling of 79820677 in words is "seventy-nine million, eight hundred twenty thousand, six hundred seventy-seven".