64439445 has 32 divisors (see below), whose sum is σ = 122959872. Its totient is φ = 28176192.

The previous prime is 64439429. The next prime is 64439449. The reversal of 64439445 is 54493446.

It is not a de Polignac number, because 64439445 - 2⁴ = 64439429 is a prime.

It is a super-5 number, since 5×64439445⁵ (a number of 40 digits) contains 55555 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64439449) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10927 + ... + 15756.

It is an arithmetic number, because the mean of its divisors is an integer number (3842496).

Almost surely, 2^64439445 is an apocalyptic number.

It is an amenable number.

64439445 is a deficient number, since it is larger than the sum of its proper divisors (58520427).

64439445 is a wasteful number, since it uses less digits than its factorization.

64439445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26721.

The product of its digits is 207360, while the sum is 39.

The square root of 64439445 is about 8027.4183272083. The cubic root of 64439445 is about 400.9134229751.

The spelling of 64439445 in words is "sixty-four million, four hundred thirty-nine thousand, four hundred forty-five".