28897793280 has 720 divisors, whose sum is σ = 110073030144. Its totient is φ = 7255941120.

The previous prime is 28897793257. The next prime is 28897793303. The reversal of 28897793280 is 8239779882.

It is a happy number.

28897793280 is a `hidden beast` number, since 288 + 9 + 7 + 79 + 3 + 280 = 666.

It is an interprime number because it is at equal distance from previous prime (28897793257) and next prime (28897793303).

It is a tau number, because it is divible by the number of its divisors (720).

It is a super-2 number, since 2×28897793280² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 781021422 + ... + 781021458.

Almost surely, 2^28897793280 is an apocalyptic number.

28897793280 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 28897793280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55036515072).

28897793280 is an abundant number, since it is smaller than the sum of its proper divisors (81175236864).

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

28897793280 is an frugal number, since it uses more digits than its factorization.

28897793280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116 (or 78 counting only the distinct ones).

The product of its (nonzero) digits is 24385536, while the sum is 63.

The spelling of 28897793280 in words is "twenty-eight billion, eight hundred ninety-seven million, seven hundred ninety-three thousand, two hundred eighty".