228425730521 has 8 divisors (see below), whose sum is σ = 234127091688. Its totient is φ = 222730560000.

The previous prime is 228425730499. The next prime is 228425730539. The reversal of 228425730521 is 125037524822.

It can be written as a sum of positive squares in 4 ways, for example, as 11768995225 + 216656735296 = 108485^2 + 465464^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228425730521 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (228425730721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1472900 + ... + 1620581.

It is an arithmetic number, because the mean of its divisors is an integer number (29265886461).

Almost surely, 2^228425730521 is an apocalyptic number.

It is an amenable number.

228425730521 is a deficient number, since it is larger than the sum of its proper divisors (5701361167).

228425730521 is a wasteful number, since it uses less digits than its factorization.

228425730521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3095323.

The product of its (nonzero) digits is 268800, while the sum is 41.

The spelling of 228425730521 in words is "two hundred twenty-eight billion, four hundred twenty-five million, seven hundred thirty thousand, five hundred twenty-one".