64544036 has 24 divisors (see below), whose sum is σ = 121859640. Its totient is φ = 29798912.

The previous prime is 64544033. The next prime is 64544059. The reversal of 64544036 is 63044546.

It can be written as a sum of positive squares in 4 ways, for example, as 22033636 + 42510400 = 4694^2 + 6520^2 .

It is a junction number, because it is equal to n+sod(n) for n = 64543993 and 64544011.

It is not an unprimeable number, because it can be changed into a prime (64544033) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5351 + ... + 12558.

It is an arithmetic number, because the mean of its divisors is an integer number (5077485).

Almost surely, 2^64544036 is an apocalyptic number.

It is an amenable number.

64544036 is a deficient number, since it is larger than the sum of its proper divisors (57315604).

64544036 is a wasteful number, since it uses less digits than its factorization.

64544036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17983 (or 17981 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 32.

The square root of 64544036 is about 8033.9302959386. The cubic root of 64544036 is about 401.1302118784.

The spelling of 64544036 in words is "sixty-four million, five hundred forty-four thousand, thirty-six".