320261264478 has 32 divisors (see below), whose sum is σ = 715064670720. Its totient is φ = 106247809080.

The previous prime is 320261264467. The next prime is 320261264483. The reversal of 320261264478 is 874462162023.

It is a happy number.

320261264478 is a `hidden beast` number, since 3 + 20 + 2 + 612 + 6 + 4 + 4 + 7 + 8 = 666.

It is a super-2 number, since 2×320261264478² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14042550 + ... + 14065337.

It is an arithmetic number, because the mean of its divisors is an integer number (22345770960).

Almost surely, 2^320261264478 is an apocalyptic number.

320261264478 is an abundant number, since it is smaller than the sum of its proper divisors (394803406242).

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

320261264478 is a wasteful number, since it uses less digits than its factorization.

320261264478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28108109 (or 28108103 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 45.

The spelling of 320261264478 in words is "three hundred twenty billion, two hundred sixty-one million, two hundred sixty-four thousand, four hundred seventy-eight".