438628661 has 8 divisors (see below), whose sum is σ = 463735200. Its totient is φ = 413724240.

The previous prime is 438628657. The next prime is 438628667. The reversal of 438628661 is 166826834.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 438628661 - 2² = 438628657 is a prime.

It is a Duffinian number.

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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46055 + ... + 54756.

It is an arithmetic number, because the mean of its divisors is an integer number (57966900).

Almost surely, 2^438628661 is an apocalyptic number.

It is an amenable number.

438628661 is a deficient number, since it is larger than the sum of its proper divisors (25106539).

438628661 is a wasteful number, since it uses less digits than its factorization.

438628661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101059.

The product of its digits is 331776, while the sum is 44.

The square root of 438628661 is about 20943.4634432799. The cubic root of 438628661 is about 759.7994975469.

The spelling of 438628661 in words is "four hundred thirty-eight million, six hundred twenty-eight thousand, six hundred sixty-one".