28130699520 has 1296 divisors, whose sum is σ = 129575537280. Its totient is φ = 5656780800.

The previous prime is 28130699491. The next prime is 28130699521. The reversal of 28130699520 is 2599603182.

28130699520 is a `hidden beast` number, since 2 + 8 + 1 + 30 + 6 + 99 + 520 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (28130699521) 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 143 ways as a sum of consecutive naturals, for example, 907441905 + ... + 907441935.

Almost surely, 2^28130699520 is an apocalyptic number.

28130699520 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 28130699520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64787768640).

28130699520 is an abundant number, since it is smaller than the sum of its proper divisors (101444837760).

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

28130699520 is a wasteful number, since it uses less digits than its factorization.

28130699520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121 (or 59 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The spelling of 28130699520 in words is "twenty-eight billion, one hundred thirty million, six hundred ninety-nine thousand, five hundred twenty".