28043366400 has 1404 divisors, whose sum is σ = 126440469792. Its totient is φ = 6131220480.

The previous prime is 28043366399. The next prime is 28043366411. The reversal of 28043366400 is 466334082.

It is a happy number.

28043366400 is a `hidden beast` number, since 2 + 8 + 0 + 4 + 3 + 3 + 6 + 640 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 1219276789 + ... + 1219276811.

Almost surely, 2^28043366400 is an apocalyptic number.

28043366400 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 28043366400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63220234896).

28043366400 is an abundant number, since it is smaller than the sum of its proper divisors (98397103392).

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

28043366400 is an equidigital number, since it uses as much as digits as its factorization.

28043366400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86 (or 40 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

The spelling of 28043366400 in words is "twenty-eight billion, forty-three million, three hundred sixty-six thousand, four hundred".