28313021394 has 160 divisors (see below), whose sum is σ = 74469897216. Its totient is φ = 7871683680.

The previous prime is 28313021393. The next prime is 28313021419. The reversal of 28313021394 is 49312031382.

It is not an unprimeable number, because it can be changed into a prime (28313021393) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 15164049 + ... + 15165915.

Almost surely, 2^28313021394 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28313021394, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37234948608).

28313021394 is an abundant number, since it is smaller than the sum of its proper divisors (46156875822).

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

28313021394 is a wasteful number, since it uses less digits than its factorization.

28313021394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2242 (or 2233 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The spelling of 28313021394 in words is "twenty-eight billion, three hundred thirteen million, twenty-one thousand, three hundred ninety-four".