64440497 has 4 divisors (see below), whose sum is σ = 70298736. Its totient is φ = 58582260.

The previous prime is 64440491. The next prime is 64440517. The reversal of 64440497 is 79404446.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 64440497 - 2⁸ = 64440241 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64440497.

It is not an unprimeable number, because it can be changed into a prime (64440491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2929103 + ... + 2929124.

It is an arithmetic number, because the mean of its divisors is an integer number (17574684).

Almost surely, 2^64440497 is an apocalyptic number.

It is an amenable number.

64440497 is a deficient number, since it is larger than the sum of its proper divisors (5858239).

64440497 is a wasteful number, since it uses less digits than its factorization.

64440497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5858238.

The product of its (nonzero) digits is 96768, while the sum is 38.

The square root of 64440497 is about 8027.4838523662. The cubic root of 64440497 is about 400.9156046545.

The spelling of 64440497 in words is "sixty-four million, four hundred forty thousand, four hundred ninety-seven".