64444661 has 16 divisors (see below), whose sum is σ = 68802048. Its totient is φ = 60278400.

The previous prime is 64444657. The next prime is 64444669. The reversal of 64444661 is 16644446.

It is a cyclic number.

It is not a de Polignac number, because 64444661 - 2² = 64444657 is a prime.

It is a super-2 number, since 2×64444661² = 8306228662809842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64444669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101816 + ... + 102446.

It is an arithmetic number, because the mean of its divisors is an integer number (4300128).

Almost surely, 2^64444661 is an apocalyptic number.

It is an amenable number.

64444661 is a deficient number, since it is larger than the sum of its proper divisors (4357387).

64444661 is a wasteful number, since it uses less digits than its factorization.

64444661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772.

The product of its digits is 55296, while the sum is 35.

The square root of 64444661 is about 8027.7432071536. The cubic root of 64444661 is about 400.9242398901.

The spelling of 64444661 in words is "sixty-four million, four hundred forty-four thousand, six hundred sixty-one".