64369969 has 2 divisors, whose sum is σ = 64369970. Its totient is φ = 64369968.

The previous prime is 64369951. The next prime is 64369979. The reversal of 64369969 is 96996346.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53479969 + 10890000 = 7313^2 + 3300^2 .

It is a cyclic number.

It is not a de Polignac number, because 64369969 - 2²¹ = 62272817 is a prime.

It is a super-2 number, since 2×64369969² = 8286985818121922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64369979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32184984 + 32184985.

It is an arithmetic number, because the mean of its divisors is an integer number (32184985).

Almost surely, 2^64369969 is an apocalyptic number.

It is an amenable number.

64369969 is a deficient number, since it is larger than the sum of its proper divisors (1).

64369969 is an equidigital number, since it uses as much as digits as its factorization.

64369969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1889568, while the sum is 52.

The square root of 64369969 is about 8023.0897414899. The cubic root of 64369969 is about 400.7692882903.

The spelling of 64369969 in words is "sixty-four million, three hundred sixty-nine thousand, nine hundred sixty-nine".