78624797 has 2 divisors, whose sum is σ = 78624798. Its totient is φ = 78624796.

The previous prime is 78624751. The next prime is 78624803. The reversal of 78624797 is 79742687.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77246521 + 1378276 = 8789^2 + 1174^2 .

It is a cyclic number.

It is not a de Polignac number, because 78624797 - 2¹² = 78620701 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 (78624737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39312398 + 39312399.

It is an arithmetic number, because the mean of its divisors is an integer number (39312399).

Almost surely, 2^78624797 is an apocalyptic number.

It is an amenable number.

78624797 is a deficient number, since it is larger than the sum of its proper divisors (1).

78624797 is an equidigital number, since it uses as much as digits as its factorization.

78624797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1185408, while the sum is 50.

The square root of 78624797 is about 8867.0624786341. The cubic root of 78624797 is about 428.4036664606.

The spelling of 78624797 in words is "seventy-eight million, six hundred twenty-four thousand, seven hundred ninety-seven".