64444536 has 96 divisors (see below), whose sum is σ = 194113920. Its totient is φ = 19180800.

The previous prime is 64444517. The next prime is 64444537. The reversal of 64444536 is 63544446.

64444536 is a `hidden beast` number, since 644 + 4 + 4 + 5 + 3 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 64444536.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64444537) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27906 + ... + 30126.

It is an arithmetic number, because the mean of its divisors is an integer number (2022020).

Almost surely, 2^64444536 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64444536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97056960).

64444536 is an abundant number, since it is smaller than the sum of its proper divisors (129669384).

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

64444536 is a wasteful number, since it uses less digits than its factorization.

64444536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2277 (or 2270 counting only the distinct ones).

The product of its digits is 138240, while the sum is 36.

The square root of 64444536 is about 8027.7354216491. The cubic root of 64444536 is about 400.9239806725.

It can be divided in two parts, 64444 and 536, that added together give a triangular number (64980 = T₃₆₀).

The spelling of 64444536 in words is "sixty-four million, four hundred forty-four thousand, five hundred thirty-six".