28294685440 has 216 divisors, whose sum is σ = 79104271680. Its totient is φ = 9668542464.

The previous prime is 28294685431. The next prime is 28294685453. The reversal of 28294685440 is 4458649282.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25651929 + ... + 25653031.

It is an arithmetic number, because the mean of its divisors is an integer number (366223480).

Almost surely, 2^28294685440 is an apocalyptic number.

28294685440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28294685440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39552135840).

28294685440 is an abundant number, since it is smaller than the sum of its proper divisors (50809586240).

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

28294685440 is a wasteful number, since it uses less digits than its factorization.

28294685440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1547 (or 1526 counting only the distinct ones).

The product of its (nonzero) digits is 4423680, while the sum is 52.

The spelling of 28294685440 in words is "twenty-eight billion, two hundred ninety-four million, six hundred eighty-five thousand, four hundred forty".