438628660 has 24 divisors (see below), whose sum is σ = 943588296. Its totient is φ = 171171840.

The previous prime is 438628657. The next prime is 438628667. The reversal of 438628660 is 66826834.

It can be written as a sum of positive squares in 4 ways, for example, as 11048976 + 427579684 = 3324^2 + 20678^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (438628667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 266637 + ... + 268276.

It is an arithmetic number, because the mean of its divisors is an integer number (39316179).

Almost surely, 2^438628660 is an apocalyptic number.

It is an amenable number.

438628660 is an abundant number, since it is smaller than the sum of its proper divisors (504959636).

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

438628660 is a wasteful number, since it uses less digits than its factorization.

438628660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534963 (or 534961 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 43.

The square root of 438628660 is about 20943.4634194061. The cubic root of 438628660 is about 759.7994969695.

The spelling of 438628660 in words is "four hundred thirty-eight million, six hundred twenty-eight thousand, six hundred sixty".