64544402 has 16 divisors (see below), whose sum is σ = 105439320. Its totient is φ = 29453952.

The previous prime is 64544351. The next prime is 64544413. The reversal of 64544402 is 20444546.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 55965361 + 8579041 = 7481^2 + 2929^2 .

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, 11633 + ... + 16260.

Almost surely, 2^64544402 is an apocalyptic number.

64544402 is a deficient number, since it is larger than the sum of its proper divisors (40894918).

64544402 is a wasteful number, since it uses less digits than its factorization.

64544402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27997.

The product of its (nonzero) digits is 15360, while the sum is 29.

The square root of 64544402 is about 8033.9530742966. The cubic root of 64544402 is about 401.1309700862.

Adding to 64544402 its reverse (20444546), we get a palindrome (84988948).

It can be divided in two parts, 64544 and 402, that added together give a palindrome (64946).

The spelling of 64544402 in words is "sixty-four million, five hundred forty-four thousand, four hundred two".