43664040 has 96 divisors (see below), whose sum is σ = 162190080. Its totient is φ = 9979776.

The previous prime is 43664009. The next prime is 43664063. The reversal of 43664040 is 4046634.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 43663995 and 43664013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6144 + ... + 11183.

It is an arithmetic number, because the mean of its divisors is an integer number (1689480).

Almost surely, 2^43664040 is an apocalyptic number.

43664040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

43664040 is an abundant number, since it is smaller than the sum of its proper divisors (118526040).

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

43664040 is a wasteful number, since it uses less digits than its factorization.

43664040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17351 (or 17344 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

The square root of 43664040 is about 6607.8771175015. The cubic root of 43664040 is about 352.1340097530.

The spelling of 43664040 in words is "forty-three million, six hundred sixty-four thousand, forty".