228407305728 has 160 divisors (see below), whose sum is σ = 697084312320. Its totient is φ = 65102929920.

The previous prime is 228407305703. The next prime is 228407305733. The reversal of 228407305728 is 827503704822.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4501363 + ... + 4551821.

It is an arithmetic number, because the mean of its divisors is an integer number (4356776952).

Almost surely, 2^228407305728 is an apocalyptic number.

228407305728 is a gapful number since it is divisible by the number (28) 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 228407305728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (348542156160).

228407305728 is an abundant number, since it is smaller than the sum of its proper divisors (468677006592).

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

228407305728 is an equidigital number, since it uses as much as digits as its factorization.

228407305728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50908 (or 50892 counting only the distinct ones).

The product of its (nonzero) digits is 1505280, while the sum is 48.

The spelling of 228407305728 in words is "two hundred twenty-eight billion, four hundred seven million, three hundred five thousand, seven hundred twenty-eight".