64404997 has 2 divisors, whose sum is σ = 64404998. Its totient is φ = 64404996.

The previous prime is 64404979. The next prime is 64405021. The reversal of 64404997 is 79940446.

Together with previous prime (64404979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61952641 + 2452356 = 7871^2 + 1566^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64404997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64404917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32202498 + 32202499.

It is an arithmetic number, because the mean of its divisors is an integer number (32202499).

Almost surely, 2^64404997 is an apocalyptic number.

It is an amenable number.

64404997 is a deficient number, since it is larger than the sum of its proper divisors (1).

64404997 is an equidigital number, since it uses as much as digits as its factorization.

64404997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 64404997 is about 8025.2723941309. The cubic root of 64404997 is about 400.8419702219.

The spelling of 64404997 in words is "sixty-four million, four hundred four thousand, nine hundred ninety-seven".