78664337 has 2 divisors, whose sum is σ = 78664338. Its totient is φ = 78664336.

The previous prime is 78664307. The next prime is 78664343. The reversal of 78664337 is 73346687.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49547521 + 29116816 = 7039^2 + 5396^2 .

It is a cyclic number.

It is not a de Polignac number, because 78664337 - 2¹⁴ = 78647953 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78664307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39332168 + 39332169.

It is an arithmetic number, because the mean of its divisors is an integer number (39332169).

Almost surely, 2^78664337 is an apocalyptic number.

It is an amenable number.

78664337 is a deficient number, since it is larger than the sum of its proper divisors (1).

78664337 is an equidigital number, since it uses as much as digits as its factorization.

78664337 is an evil number, because the sum of its binary digits is even.

The product of its digits is 508032, while the sum is 44.

The square root of 78664337 is about 8869.2917981088. The cubic root of 78664337 is about 428.4754684149.

The spelling of 78664337 in words is "seventy-eight million, six hundred sixty-four thousand, three hundred thirty-seven".