64400969 has 2 divisors, whose sum is σ = 64400970. Its totient is φ = 64400968.

The previous prime is 64400957. The next prime is 64401017. The reversal of 64400969 is 96900446.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60637369 + 3763600 = 7787^2 + 1940^2 .

It is a cyclic number.

It is not a de Polignac number, because 64400969 - 2⁴ = 64400953 is a prime.

It is a super-2 number, since 2×64400969² = 8294969616277922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64400939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32200484 + 32200485.

It is an arithmetic number, because the mean of its divisors is an integer number (32200485).

Almost surely, 2^64400969 is an apocalyptic number.

It is an amenable number.

64400969 is a deficient number, since it is larger than the sum of its proper divisors (1).

64400969 is an equidigital number, since it uses as much as digits as its factorization.

64400969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 64400969 is about 8025.0214329932. The cubic root of 64400969 is about 400.8336135974.

The spelling of 64400969 in words is "sixty-four million, four hundred thousand, nine hundred sixty-nine".