83657879 has 2 divisors, whose sum is σ = 83657880. Its totient is φ = 83657878.

The previous prime is 83657839. The next prime is 83657897. The reversal of 83657879 is 97875638.

Together with next prime (83657897) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-83657879 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 83657879.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83657839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41828939 + 41828940.

It is an arithmetic number, because the mean of its divisors is an integer number (41828940).

Almost surely, 2^83657879 is an apocalyptic number.

83657879 is a deficient number, since it is larger than the sum of its proper divisors (1).

83657879 is an equidigital number, since it uses as much as digits as its factorization.

83657879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2540160, while the sum is 53.

The square root of 83657879 is about 9146.4681161637. The cubic root of 83657879 is about 437.3565313523.

The spelling of 83657879 in words is "eighty-three million, six hundred fifty-seven thousand, eight hundred seventy-nine".