64449625 has 8 divisors (see below), whose sum is σ = 80433288. Its totient is φ = 51559600.

The previous prime is 64449607. The next prime is 64449641. The reversal of 64449625 is 52694446.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 841 + 64448784 = 29^2 + 8028^2 .

It is not a de Polignac number, because 64449625 - 2²³ = 56061017 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 257674 + ... + 257923.

It is an arithmetic number, because the mean of its divisors is an integer number (10054161).

Almost surely, 2^64449625 is an apocalyptic number.

It is an amenable number.

64449625 is a deficient number, since it is larger than the sum of its proper divisors (15983663).

64449625 is an equidigital number, since it uses as much as digits as its factorization.

64449625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515612 (or 515602 counting only the distinct ones).

The product of its digits is 207360, while the sum is 40.

The square root of 64449625 is about 8028.0523790020. The cubic root of 64449625 is about 400.9345336667.

The spelling of 64449625 in words is "sixty-four million, four hundred forty-nine thousand, six hundred twenty-five".