320642431305 has 64 divisors (see below), whose sum is σ = 601329028608. Its totient is φ = 142835005440.

The previous prime is 320642431297. The next prime is 320642431349. The reversal of 320642431305 is 503134246023.

It is a happy number.

It is not a de Polignac number, because 320642431305 - 2³ = 320642431297 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3628507 + ... + 3715823.

It is an arithmetic number, because the mean of its divisors is an integer number (9395766072).

Almost surely, 2^320642431305 is an apocalyptic number.

320642431305 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

320642431305 is a deficient number, since it is larger than the sum of its proper divisors (280686597303).

320642431305 is a wasteful number, since it uses less digits than its factorization.

320642431305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88226.

The product of its (nonzero) digits is 51840, while the sum is 33.

Adding to 320642431305 its reverse (503134246023), we get a palindrome (823776677328).

The spelling of 320642431305 in words is "three hundred twenty billion, six hundred forty-two million, four hundred thirty-one thousand, three hundred five".