78626497 has 2 divisors, whose sum is σ = 78626498. Its totient is φ = 78626496.

The previous prime is 78626437. The next prime is 78626501. The reversal of 78626497 is 79462687.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45171841 + 33454656 = 6721^2 + 5784^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78626497 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78626497.

It is not a weakly prime, because it can be changed into another prime (78626437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39313248 + 39313249.

It is an arithmetic number, because the mean of its divisors is an integer number (39313249).

Almost surely, 2^78626497 is an apocalyptic number.

It is an amenable number.

78626497 is a deficient number, since it is larger than the sum of its proper divisors (1).

78626497 is an equidigital number, since it uses as much as digits as its factorization.

78626497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1016064, while the sum is 49.

The square root of 78626497 is about 8867.1583384983. The cubic root of 78626497 is about 428.4067540403.

The spelling of 78626497 in words is "seventy-eight million, six hundred twenty-six thousand, four hundred ninety-seven".