64403897 has 2 divisors, whose sum is σ = 64403898. Its totient is φ = 64403896.

The previous prime is 64403893. The next prime is 64403903. The reversal of 64403897 is 79830446.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64384576 + 19321 = 8024^2 + 139^2 .

It is a cyclic number.

It is not a de Polignac number, because 64403897 - 2² = 64403893 is a prime.

It is not a weakly prime, because it can be changed into another prime (64403893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32201948 + 32201949.

It is an arithmetic number, because the mean of its divisors is an integer number (32201949).

Almost surely, 2^64403897 is an apocalyptic number.

It is an amenable number.

64403897 is a deficient number, since it is larger than the sum of its proper divisors (1).

64403897 is an equidigital number, since it uses as much as digits as its factorization.

64403897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 64403897 is about 8025.2038603390. The cubic root of 64403897 is about 400.8396881594.

The spelling of 64403897 in words is "sixty-four million, four hundred three thousand, eight hundred ninety-seven".