28307528331 has 8 divisors (see below), whose sum is σ = 37795290624. Its totient is φ = 18845725800.

The previous prime is 28307528329. The next prime is 28307528351. The reversal of 28307528331 is 13382570382.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28307528331 - 2¹ = 28307528329 is a prime.

It is a super-2 number, since 2×28307528331² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28307528351) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 6487395 + ... + 6491756.

It is an arithmetic number, because the mean of its divisors is an integer number (4724411328).

Almost surely, 2^28307528331 is an apocalyptic number.

28307528331 is a deficient number, since it is larger than the sum of its proper divisors (9487762293).

28307528331 is a wasteful number, since it uses less digits than its factorization.

28307528331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12979881.

The product of its (nonzero) digits is 241920, while the sum is 42.

The spelling of 28307528331 in words is "twenty-eight billion, three hundred seven million, five hundred twenty-eight thousand, three hundred thirty-one".