28529438450 has 18 divisors (see below), whose sum is σ = 53066977101. Its totient is φ = 11411297640.

The previous prime is 28529438449. The next prime is 28529438461. The reversal of 28529438450 is 5483492582.

It can be written as a sum of positive squares in 2 ways, for example, as 27958849681 + 570588769 = 167209^2 + 23887^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=119435.

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

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1182407 + ... + 1206293.

Almost surely, 2^28529438450 is an apocalyptic number.

28529438450 is a deficient number, since it is larger than the sum of its proper divisors (24537538651).

28529438450 is an frugal number, since it uses more digits than its factorization.

28529438450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47786 (or 23894 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 50.

Multiplying 28529438450 by its sum of digits (50), we get a square (1426471922500 = 1194350²).

28529438450 divided by its sum of digits (50) gives a square (570588769 = 23887²).

The spelling of 28529438450 in words is "twenty-eight billion, five hundred twenty-nine million, four hundred thirty-eight thousand, four hundred fifty".