28684567400 has 24 divisors (see below), whose sum is σ = 66691619670. Its totient is φ = 11473826880.

The previous prime is 28684567399. The next prime is 28684567403. The reversal of 28684567400 is 476548682.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 23678438884 + 5006128516 = 153878^2 + 70754^2 .

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is not an unprimeable number, because it can be changed into a prime (28684567403) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 71711219 + ... + 71711618.

Almost surely, 2^28684567400 is an apocalyptic number.

28684567400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28684567400 is an abundant number, since it is smaller than the sum of its proper divisors (38007052270).

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

28684567400 is a wasteful number, since it uses less digits than its factorization.

28684567400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143422853 (or 143422844 counting only the distinct ones).

The product of its (nonzero) digits is 2580480, while the sum is 50.

The spelling of 28684567400 in words is "twenty-eight billion, six hundred eighty-four million, five hundred sixty-seven thousand, four hundred".