28651619880 has 192 divisors, whose sum is σ = 100684321920. Its totient is φ = 7024320000.

The previous prime is 28651619833. The next prime is 28651619921. The reversal of 28651619880 is 8891615682.

It is a happy number.

It is a super-2 number, since 2×28651619880² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1162485 + ... + 1186875.

It is an arithmetic number, because the mean of its divisors is an integer number (524397510).

Almost surely, 2^28651619880 is an apocalyptic number.

28651619880 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 28651619880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50342160960).

28651619880 is an abundant number, since it is smaller than the sum of its proper divisors (72032702040).

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

28651619880 is a wasteful number, since it uses less digits than its factorization.

28651619880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24672 (or 24665 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 54.

The spelling of 28651619880 in words is "twenty-eight billion, six hundred fifty-one million, six hundred nineteen thousand, eight hundred eighty".