64434649 has 4 divisors (see below), whose sum is σ = 66176164. Its totient is φ = 62693136.

The previous prime is 64434619. The next prime is 64434659. The reversal of 64434649 is 94643446.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 49956624 + 14478025 = 7068^2 + 3805^2 .

It is a cyclic number.

It is not a de Polignac number, because 64434649 - 2¹⁵ = 64401881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64434619) 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, 870702 + ... + 870775.

It is an arithmetic number, because the mean of its divisors is an integer number (16544041).

Almost surely, 2^64434649 is an apocalyptic number.

It is an amenable number.

64434649 is a deficient number, since it is larger than the sum of its proper divisors (1741515).

64434649 is a wasteful number, since it uses less digits than its factorization.

64434649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1741514.

The product of its digits is 248832, while the sum is 40.

The square root of 64434649 is about 8027.1195954713. The cubic root of 64434649 is about 400.9034765389.

The spelling of 64434649 in words is "sixty-four million, four hundred thirty-four thousand, six hundred forty-nine".