28951022500 has 135 divisors (see below), whose sum is σ = 65683156693. Its totient is φ = 11161840000.

The previous prime is 28951022473. The next prime is 28951022521. The reversal of 28951022500 is 522015982.

It is a happy number.

The square root of 28951022500 is 170150.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 7 ways, for example, as 28838153124 + 112869376 = 169818^2 + 10624^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 348807459 + ... + 348807541.

Almost surely, 2^28951022500 is an apocalyptic number.

28951022500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

28951022500 is the 170150-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28951022500

28951022500 is an abundant number, since it is smaller than the sum of its proper divisors (36732134193).

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

28951022500 is an frugal number, since it uses more digits than its factorization.

28951022500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272 (or 131 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 34.

Multiplying 28951022500 by its product of nonzero digits (14400), we get a square (416894724000000 = 20418000²).

The spelling of 28951022500 in words is "twenty-eight billion, nine hundred fifty-one million, twenty-two thousand, five hundred".