28989148644 has 81 divisors (see below), whose sum is σ = 76165118211. Its totient is φ = 9653855400.

The previous prime is 28989148613. The next prime is 28989148679. The reversal of 28989148644 is 44684198982.

The square root of 28989148644 is 170262.

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

28989148644 is a `hidden beast` number, since 28 + 9 + 8 + 91 + 486 + 44 = 666.

It is a tau number, because it is divible by the number of its divisors (81).

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 27581919 + ... + 27582969.

Almost surely, 2^28989148644 is an apocalyptic number.

28989148644 is the 170262-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28989148644

28989148644 is an abundant number, since it is smaller than the sum of its proper divisors (47175969567).

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

28989148644 is an frugal number, since it uses more digits than its factorization.

28989148644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2130 (or 1056 counting only the distinct ones).

The product of its digits is 31850496, while the sum is 63.

The spelling of 28989148644 in words is "twenty-eight billion, nine hundred eighty-nine million, one hundred forty-eight thousand, six hundred forty-four".