64133844 has 36 divisors (see below), whose sum is σ = 156450336. Its totient is φ = 20446448.

The previous prime is 64133833. The next prime is 64133863. The reversal of 64133844 is 44833146.

It is a happy number.

It is a super-2 number, since 2×64133844² = 8226299892432672, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1297 + ... + 11399.

Almost surely, 2^64133844 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 64133844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78225168).

64133844 is an abundant number, since it is smaller than the sum of its proper divisors (92316492).

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

64133844 is a wasteful number, since it uses less digits than its factorization.

64133844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10156 (or 10131 counting only the distinct ones).

The product of its digits is 27648, while the sum is 33.

The square root of 64133844 is about 8008.3608809793. The cubic root of 64133844 is about 400.2786475105.

The spelling of 64133844 in words is "sixty-four million, one hundred thirty-three thousand, eight hundred forty-four".