664441431 has 8 divisors (see below), whose sum is σ = 894201984. Its totient is φ = 438820920.

The previous prime is 664441399. The next prime is 664441433. The reversal of 664441431 is 134144466.

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

It is not a de Polignac number, because 664441431 - 2⁵ = 664441399 is a prime.

It is a super-2 number, since 2×664441431² = 882964830458655522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 664441392 and 664441401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664441433) 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, 1034635 + ... + 1035276.

It is an arithmetic number, because the mean of its divisors is an integer number (111775248).

Almost surely, 2^664441431 is an apocalyptic number.

664441431 is a deficient number, since it is larger than the sum of its proper divisors (229760553).

664441431 is a wasteful number, since it uses less digits than its factorization.

664441431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2070021.

The product of its digits is 27648, while the sum is 33.

The square root of 664441431 is about 25776.7614529056. The cubic root of 664441431 is about 872.6074201012.

Adding to 664441431 its reverse (134144466), we get a palindrome (798585897).

The spelling of 664441431 in words is "six hundred sixty-four million, four hundred forty-one thousand, four hundred thirty-one".