438528820 has 12 divisors (see below), whose sum is σ = 920910564. Its totient is φ = 175411520.

The previous prime is 438528809. The next prime is 438528823. The reversal of 438528820 is 28825834.

It can be written as a sum of positive squares in 2 ways, for example, as 215384976 + 223143844 = 14676^2 + 14938^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (438528823) 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, 10963201 + ... + 10963240.

It is an arithmetic number, because the mean of its divisors is an integer number (76742547).

Almost surely, 2^438528820 is an apocalyptic number.

It is an amenable number.

438528820 is an abundant number, since it is smaller than the sum of its proper divisors (482381744).

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

438528820 is a wasteful number, since it uses less digits than its factorization.

438528820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21926450 (or 21926448 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 40.

The square root of 438528820 is about 20941.0797238347. The cubic root of 438528820 is about 759.7418444530.

The spelling of 438528820 in words is "four hundred thirty-eight million, five hundred twenty-eight thousand, eight hundred twenty".