64043988 has 24 divisors (see below), whose sum is σ = 151542720. Its totient is φ = 21047040.

The previous prime is 64043951. The next prime is 64043989. The reversal of 64043988 is 88934046.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64043989) 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, 36733 + ... + 38436.

It is an arithmetic number, because the mean of its divisors is an integer number (6314280).

Almost surely, 2^64043988 is an apocalyptic number.

It is an amenable number.

64043988 is an abundant number, since it is smaller than the sum of its proper divisors (87498732).

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

64043988 is a wasteful number, since it uses less digits than its factorization.

64043988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75247 (or 75245 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 42.

The square root of 64043988 is about 8002.7487777638. The cubic root of 64043988 is about 400.0916206792.

The spelling of 64043988 in words is "sixty-four million, forty-three thousand, nine hundred eighty-eight".