28910454720 has 448 divisors, whose sum is σ = 112702848000. Its totient is φ = 6258954240.

The previous prime is 28910454709. The next prime is 28910454743. The reversal of 28910454720 is 2745401982.

It is a tau number, because it is divible by the number of its divisors (448).

It is a Harshad number since it is a multiple of its sum of digits (42).

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 63 ways as a sum of consecutive naturals, for example, 6254010 + ... + 6258630.

Almost surely, 2^28910454720 is an apocalyptic number.

28910454720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28910454720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56351424000).

28910454720 is an abundant number, since it is smaller than the sum of its proper divisors (83792393280).

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

28910454720 is a wasteful number, since it uses less digits than its factorization.

28910454720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4681 (or 4657 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 42.

The spelling of 28910454720 in words is "twenty-eight billion, nine hundred ten million, four hundred fifty-four thousand, seven hundred twenty".