28394821191040 has 64 divisors (see below), whose sum is σ = 67883494520160. Its totient is φ = 11357572902912.

The previous prime is 28394821191029. The next prime is 28394821191043. The reversal of 28394821191040 is 4019112849382.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×28394821191040² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28394821191043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20258197 + ... + 21614443.

Almost surely, 2^{28394821191040} is an apocalyptic number.

28394821191040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28394821191040 is an abundant number, since it is smaller than the sum of its proper divisors (39488673329120).

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

28394821191040 is a wasteful number, since it uses less digits than its factorization.

28394821191040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1388979 (or 1388967 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 52.

The spelling of 28394821191040 in words is "twenty-eight trillion, three hundred ninety-four billion, eight hundred twenty-one million, one hundred ninety-one thousand, forty".