28897067520 has 800 divisors, whose sum is σ = 110798658432. Its totient is φ = 7182286848.

The previous prime is 28897067489. The next prime is 28897067527. The reversal of 28897067520 is 2576079882.

It is a happy number.

28897067520 is a `hidden beast` number, since 28 + 8 + 97 + 0 + 6 + 7 + 520 = 666.

It is a super-2 number, since 2×28897067520² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (28897067527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 348157399 + ... + 348157481.

Almost surely, 2^28897067520 is an apocalyptic number.

28897067520 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 28897067520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55399329216).

28897067520 is an abundant number, since it is smaller than the sum of its proper divisors (81901590912).

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

28897067520 is an equidigital number, since it uses as much as digits as its factorization.

28897067520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214 (or 189 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 54.

The spelling of 28897067520 in words is "twenty-eight billion, eight hundred ninety-seven million, sixty-seven thousand, five hundred twenty".