64678477 has 2 divisors, whose sum is σ = 64678478. Its totient is φ = 64678476.

The previous prime is 64678469. The next prime is 64678487. The reversal of 64678477 is 77487646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51926436 + 12752041 = 7206^2 + 3571^2 .

It is a cyclic number.

It is not a de Polignac number, because 64678477 - 2³ = 64678469 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64678477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64678447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32339238 + 32339239.

It is an arithmetic number, because the mean of its divisors is an integer number (32339239).

Almost surely, 2^64678477 is an apocalyptic number.

It is an amenable number.

64678477 is a deficient number, since it is larger than the sum of its proper divisors (1).

64678477 is an equidigital number, since it uses as much as digits as its factorization.

64678477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1580544, while the sum is 49.

The square root of 64678477 is about 8042.2930187851. The cubic root of 64678477 is about 401.4085280501.

The spelling of 64678477 in words is "sixty-four million, six hundred seventy-eight thousand, four hundred seventy-seven".