64678723 has 2 divisors, whose sum is σ = 64678724. Its totient is φ = 64678722.

The previous prime is 64678699. The next prime is 64678759. The reversal of 64678723 is 32787646.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64678723 - 2¹³ = 64670531 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64678723.

It is not a weakly prime, because it can be changed into another prime (64678123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32339361 + 32339362.

It is an arithmetic number, because the mean of its divisors is an integer number (32339362).

Almost surely, 2^64678723 is an apocalyptic number.

64678723 is a deficient number, since it is larger than the sum of its proper divisors (1).

64678723 is an equidigital number, since it uses as much as digits as its factorization.

64678723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 338688, while the sum is 43.

The square root of 64678723 is about 8042.3083129161. The cubic root of 64678723 is about 401.4090369590.

The spelling of 64678723 in words is "sixty-four million, six hundred seventy-eight thousand, seven hundred twenty-three".