306221988872 has 36 divisors (see below), whose sum is σ = 577920528045. Its totient is φ = 152116325088.

The previous prime is 306221988871. The next prime is 306221988881. The reversal of 306221988872 is 278889122603.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 189822290596 + 116399698276 = 435686^2 + 341174^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=391294.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (306221988871) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 280165958 + ... + 280167050.

Almost surely, 2^306221988872 is an apocalyptic number.

It is an amenable number.

306221988872 is a deficient number, since it is larger than the sum of its proper divisors (271698539173).

306221988872 is an frugal number, since it uses more digits than its factorization.

306221988872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2550 (or 1274 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 56.

The spelling of 306221988872 in words is "three hundred six billion, two hundred twenty-one million, nine hundred eighty-eight thousand, eight hundred seventy-two".