28777265280 has 768 divisors, whose sum is σ = 109494927360. Its totient is φ = 7211151360.

The previous prime is 28777265273. The next prime is 28777265323. The reversal of 28777265280 is 8256277782.

28777265280 is a `hidden beast` number, since 28 + 7 + 77 + 26 + 528 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 226592577 + ... + 226592703.

It is an arithmetic number, because the mean of its divisors is an integer number (142571520).

Almost surely, 2^28777265280 is an apocalyptic number.

28777265280 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 28777265280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54747463680).

28777265280 is an abundant number, since it is smaller than the sum of its proper divisors (80717662080).

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

28777265280 is a wasteful number, since it uses less digits than its factorization.

28777265280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239 (or 215 counting only the distinct ones).

The product of its (nonzero) digits is 5268480, while the sum is 54.

The spelling of 28777265280 in words is "twenty-eight billion, seven hundred seventy-seven million, two hundred sixty-five thousand, two hundred eighty".