44391864 has 32 divisors (see below), whose sum is σ = 121069440. Its totient is φ = 13452000.

The previous prime is 44391833. The next prime is 44391869. The reversal of 44391864 is 46819344.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (44391869) 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, 83812 + ... + 84339.

It is an arithmetic number, because the mean of its divisors is an integer number (3783420).

Almost surely, 2^44391864 is an apocalyptic number.

44391864 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

44391864 is an abundant number, since it is smaller than the sum of its proper divisors (76677576).

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

44391864 is a wasteful number, since it uses less digits than its factorization.

44391864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168171 (or 168167 counting only the distinct ones).

The product of its digits is 82944, while the sum is 39.

The square root of 44391864 is about 6662.7219662838. The cubic root of 44391864 is about 354.0797802887.

The spelling of 44391864 in words is "forty-four million, three hundred ninety-one thousand, eight hundred sixty-four".