28922019840 has 544 divisors, whose sum is σ = 117775157760. Its totient is φ = 6596591616.

The previous prime is 28922019839. The next prime is 28922019851. The reversal of 28922019840 is 4891022982.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

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 31 ways as a sum of consecutive naturals, for example, 61931287 + ... + 61931753.

Almost surely, 2^28922019840 is an apocalyptic number.

28922019840 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 28922019840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58887578880).

28922019840 is an abundant number, since it is smaller than the sum of its proper divisors (88853137920).

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

28922019840 is an frugal number, since it uses more digits than its factorization.

28922019840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520 (or 484 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The spelling of 28922019840 in words is "twenty-eight billion, nine hundred twenty-two million, nineteen thousand, eight hundred forty".