64449936 has 30 divisors (see below), whose sum is σ = 180370710. Its totient is φ = 21483264.

The previous prime is 64449901. The next prime is 64449943. The reversal of 64449936 is 63994446.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 42771600 + 21678336 = 6540^2 + 4656^2 .

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 64449891 and 64449900.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 223641 + ... + 223928.

It is an arithmetic number, because the mean of its divisors is an integer number (6012357).

Almost surely, 2^64449936 is an apocalyptic number.

It is an amenable number.

64449936 is an abundant number, since it is smaller than the sum of its proper divisors (115920774).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64449936 is a wasteful number, since it uses less digits than its factorization.

64449936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447583 (or 447574 counting only the distinct ones).

The product of its digits is 559872, while the sum is 45.

The square root of 64449936 is about 8028.0717485583. The cubic root of 64449936 is about 400.9351785654.

The spelling of 64449936 in words is "sixty-four million, four hundred forty-nine thousand, nine hundred thirty-six".