320004240 has 80 divisors (see below), whose sum is σ = 993769728. Its totient is φ = 85183488.

The previous prime is 320004233. The next prime is 320004257. The reversal of 320004240 is 42400023.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 224169 + ... + 225591.

Almost surely, 2^320004240 is an apocalyptic number.

320004240 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

320004240 is an abundant number, since it is smaller than the sum of its proper divisors (673765488).

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

320004240 is a wasteful number, since it uses less digits than its factorization.

320004240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2376 (or 2370 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 15.

The square root of 320004240 is about 17888.6623312086. The cubic root of 320004240 is about 683.9933996148.

Adding to 320004240 its reverse (42400023), we get a palindrome (362404263).

The spelling of 320004240 in words is "three hundred twenty million, four thousand, two hundred forty".