320497812 has 18 divisors (see below), whose sum is σ = 810147338. Its totient is φ = 106832592.

The previous prime is 320497781. The next prime is 320497829. The reversal of 320497812 is 218794023.

It can be written as a sum of positive squares in only one way, i.e., 313077636 + 7420176 = 17694^2 + 2724^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 8902717 = 320497812 / (3 + 2 + 0 + 4 + 9 + 7 + 8 + 1 + 2).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4451323 + ... + 4451394.

Almost surely, 2^320497812 is an apocalyptic number.

It is an amenable number.

320497812 is an abundant number, since it is smaller than the sum of its proper divisors (489649526).

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

320497812 is a wasteful number, since it uses less digits than its factorization.

320497812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8902727 (or 8902722 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 320497812 is about 17902.4526811272. The cubic root of 320497812 is about 684.3448809664.

The spelling of 320497812 in words is "three hundred twenty million, four hundred ninety-seven thousand, eight hundred twelve".