28989655380 has 180 divisors, whose sum is σ = 105789524148. Its totient is φ = 6626188800.

The previous prime is 28989655309. The next prime is 28989655397. The reversal of 28989655380 is 8355698982.

28989655380 is a `hidden beast` number, since 2 + 8 + 9 + 8 + 96 + 5 + 538 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 19843793424 + 9145861956 = 140868^2 + 95634^2 .

It is a tau number, because it is divible by the number of its divisors (180).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 103221 + ... + 261980.

Almost surely, 2^28989655380 is an apocalyptic number.

28989655380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28989655380 is an abundant number, since it is smaller than the sum of its proper divisors (76799868768).

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

28989655380 is a wasteful number, since it uses less digits than its factorization.

28989655380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365236 (or 365218 counting only the distinct ones).

The product of its (nonzero) digits is 37324800, while the sum is 63.

The spelling of 28989655380 in words is "twenty-eight billion, nine hundred eighty-nine million, six hundred fifty-five thousand, three hundred eighty".