28529307400 has 72 divisors (see below), whose sum is σ = 72908946810. Its totient is φ = 10374284800.

The previous prime is 28529307377. The next prime is 28529307419. The reversal of 28529307400 is 470392582.

It can be written as a sum of positive squares in 3 ways, for example, as 22426260516 + 6103046884 = 149754^2 + 78122^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 565249 + ... + 613648.

Almost surely, 2^28529307400 is an apocalyptic number.

28529307400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28529307400 is an abundant number, since it is smaller than the sum of its proper divisors (44379639410).

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

28529307400 is a wasteful number, since it uses less digits than its factorization.

28529307400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1178935 (or 1178915 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 40.

Adding to 28529307400 its reverse (470392582), we get a palindrome (28999699982).

The spelling of 28529307400 in words is "twenty-eight billion, five hundred twenty-nine million, three hundred seven thousand, four hundred".