64468721 has 2 divisors, whose sum is σ = 64468722. Its totient is φ = 64468720.

The previous prime is 64468699. The next prime is 64468727. The reversal of 64468721 is 12786446.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34339600 + 30129121 = 5860^2 + 5489^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64468721 is a prime.

It is not a weakly prime, because it can be changed into another prime (64468727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32234360 + 32234361.

It is an arithmetic number, because the mean of its divisors is an integer number (32234361).

Almost surely, 2^64468721 is an apocalyptic number.

It is an amenable number.

64468721 is a deficient number, since it is larger than the sum of its proper divisors (1).

64468721 is an equidigital number, since it uses as much as digits as its factorization.

64468721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64512, while the sum is 38.

The square root of 64468721 is about 8029.2416204770. The cubic root of 64468721 is about 400.9741278449.

The spelling of 64468721 in words is "sixty-four million, four hundred sixty-eight thousand, seven hundred twenty-one".