78996641 has 2 divisors, whose sum is σ = 78996642. Its totient is φ = 78996640.

The previous prime is 78996607. The next prime is 78996677. The reversal of 78996641 is 14669987.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78836641 + 160000 = 8879^2 + 400^2 .

It is an emirp because it is prime and its reverse (14669987) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78996641 - 2²² = 74802337 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 78996641.

It is not a weakly prime, because it can be changed into another prime (78996601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39498320 + 39498321.

It is an arithmetic number, because the mean of its divisors is an integer number (39498321).

Almost surely, 2^78996641 is an apocalyptic number.

It is an amenable number.

78996641 is a deficient number, since it is larger than the sum of its proper divisors (1).

78996641 is an equidigital number, since it uses as much as digits as its factorization.

78996641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 50.

The square root of 78996641 is about 8888.0054567940. The cubic root of 78996641 is about 429.0779612101.

The spelling of 78996641 in words is "seventy-eight million, nine hundred ninety-six thousand, six hundred forty-one".