28131625326 has 64 divisors (see below), whose sum is σ = 66080222208. Its totient is φ = 7815460608.

The previous prime is 28131625309. The next prime is 28131625349. The reversal of 28131625326 is 62352613182.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 2968071 + ... + 2977533.

It is an arithmetic number, because the mean of its divisors is an integer number (1032503472).

Almost surely, 2^28131625326 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28131625326, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33040111104).

28131625326 is an abundant number, since it is smaller than the sum of its proper divisors (37948596882).

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

28131625326 is a wasteful number, since it uses less digits than its factorization.

28131625326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11425.

The product of its digits is 103680, while the sum is 39.

The spelling of 28131625326 in words is "twenty-eight billion, one hundred thirty-one million, six hundred twenty-five thousand, three hundred twenty-six".