28355489040 has 160 divisors (see below), whose sum is σ = 92672640000. Its totient is φ = 7152330240.

The previous prime is 28355489023. The next prime is 28355489047. The reversal of 28355489040 is 4098455382.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (28355489047) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3146461 + ... + 3155459.

It is an arithmetic number, because the mean of its divisors is an integer number (579204000).

Almost surely, 2^28355489040 is an apocalyptic number.

28355489040 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 28355489040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46336320000).

28355489040 is an abundant number, since it is smaller than the sum of its proper divisors (64317150960).

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

28355489040 is a wasteful number, since it uses less digits than its factorization.

28355489040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9725 (or 9719 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 48.

The spelling of 28355489040 in words is "twenty-eight billion, three hundred fifty-five million, four hundred eighty-nine thousand, forty".