28651379880 has 64 divisors (see below), whose sum is σ = 87953088960. Its totient is φ = 7462683648.

The previous prime is 28651379833. The next prime is 28651379881. The reversal of 28651379880 is 8897315682.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 28651379880.

It is not an unprimeable number, because it can be changed into a prime (28651379881) 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, 2771137 + ... + 2781456.

It is an arithmetic number, because the mean of its divisors is an integer number (1374267015).

Almost surely, 2^28651379880 is an apocalyptic number.

28651379880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28651379880 is an abundant number, since it is smaller than the sum of its proper divisors (59301709080).

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

28651379880 is a wasteful number, since it uses less digits than its factorization.

28651379880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5552650 (or 5552646 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 57.

The spelling of 28651379880 in words is "twenty-eight billion, six hundred fifty-one million, three hundred seventy-nine thousand, eight hundred eighty".