45381664 has 24 divisors (see below), whose sum is σ = 89506620. Its totient is φ = 22649856.

The previous prime is 45381631. The next prime is 45381667. The reversal of 45381664 is 46618354.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 44997264 + 384400 = 6708^2 + 620^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45381667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25012 + ... + 26764.

Almost surely, 2^45381664 is an apocalyptic number.

It is an amenable number.

45381664 is a deficient number, since it is larger than the sum of its proper divisors (44124956).

45381664 is a wasteful number, since it uses less digits than its factorization.

45381664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2572 (or 2564 counting only the distinct ones).

The product of its digits is 69120, while the sum is 37.

The square root of 45381664 is about 6736.5914229676. The cubic root of 45381664 is about 356.6920846396.

The spelling of 45381664 in words is "forty-five million, three hundred eighty-one thousand, six hundred sixty-four".