28961719980 has 48 divisors (see below), whose sum is σ = 81102246624. Its totient is φ = 7722227200.

The previous prime is 28961719973. The next prime is 28961719987. The reversal of 28961719980 is 8991716982.

It is an interprime number because it is at equal distance from previous prime (28961719973) and next prime (28961719987).

It is a Harshad number since it is a multiple of its sum of digits (60).

It is not an unprimeable number, because it can be changed into a prime (28961719987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 613294 + ... + 658826.

It is an arithmetic number, because the mean of its divisors is an integer number (1689630138).

Almost surely, 2^28961719980 is an apocalyptic number.

28961719980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28961719980 is an abundant number, since it is smaller than the sum of its proper divisors (52140526644).

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

28961719980 is a wasteful number, since it uses less digits than its factorization.

28961719980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56146 (or 56144 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 60.

The spelling of 28961719980 in words is "twenty-eight billion, nine hundred sixty-one million, seven hundred nineteen thousand, nine hundred eighty".