28986877720 has 16 divisors (see below), whose sum is σ = 65220474960. Its totient is φ = 11594751072.

The previous prime is 28986877709. The next prime is 28986877721. The reversal of 28986877720 is 2777868982.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28986877721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 362335932 + ... + 362336011.

It is an arithmetic number, because the mean of its divisors is an integer number (4076279685).

Almost surely, 2^28986877720 is an apocalyptic number.

28986877720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28986877720 is an abundant number, since it is smaller than the sum of its proper divisors (36233597240).

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

28986877720 is a wasteful number, since it uses less digits than its factorization.

28986877720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724671954 (or 724671950 counting only the distinct ones).

The product of its (nonzero) digits is 37933056, while the sum is 64.

The spelling of 28986877720 in words is "twenty-eight billion, nine hundred eighty-six million, eight hundred seventy-seven thousand, seven hundred twenty".