7312820 has 12 divisors (see below), whose sum is σ = 15356964. Its totient is φ = 2925120.

The previous prime is 7312819. The next prime is 7312831. The reversal of 7312820 is 282137.

It can be written as a sum of positive squares in 2 ways, for example, as 3912484 + 3400336 = 1978^2 + 1844^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 182801 + ... + 182840.

It is an arithmetic number, because the mean of its divisors is an integer number (1279747).

Almost surely, 2^7312820 is an apocalyptic number.

It is an amenable number.

7312820 is an abundant number, since it is smaller than the sum of its proper divisors (8044144).

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

7312820 is a wasteful number, since it uses less digits than its factorization.

7312820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365650 (or 365648 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 7312820 is about 2704.2226239716. Note that the first 3 decimals coincide. The cubic root of 7312820 is about 194.1012331680.

Adding to 7312820 its reverse (282137), we get a palindrome (7594957).

The spelling of 7312820 in words is "seven million, three hundred twelve thousand, eight hundred twenty".