28993513980 has 96 divisors (see below), whose sum is σ = 86415033600. Its totient is φ = 7242352128.

The previous prime is 28993513979. The next prime is 28993514003. The reversal of 28993513980 is 8931539982.

It is a super-3 number, since 3×28993513980³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a self number, because there is not a number n which added to its sum of digits gives 28993513980.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41422 + ... + 244341.

It is an arithmetic number, because the mean of its divisors is an integer number (900156600).

Almost surely, 2^28993513980 is an apocalyptic number.

28993513980 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 28993513980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43207516800).

28993513980 is an abundant number, since it is smaller than the sum of its proper divisors (57421519620).

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

28993513980 is a wasteful number, since it uses less digits than its factorization.

28993513980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285883 (or 285881 counting only the distinct ones).

The product of its (nonzero) digits is 4199040, while the sum is 57.

The spelling of 28993513980 in words is "twenty-eight billion, nine hundred ninety-three million, five hundred thirteen thousand, nine hundred eighty".