228920641 has 6 divisors (see below), whose sum is σ = 231219926. Its totient is φ = 226644000.

The previous prime is 228920639. The next prime is 228920651. The reversal of 228920641 is 146029822.

It can be written as a sum of positive squares in 3 ways, for example, as 89586225 + 139334416 = 9465^2 + 11804^2 .

It is not a de Polignac number, because 228920641 - 2¹ = 228920639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 228920597 and 228920606.

It is not an unprimeable number, because it can be changed into a prime (228920651) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1020 + ... + 21421.

Almost surely, 2^228920641 is an apocalyptic number.

It is an amenable number.

228920641 is a deficient number, since it is larger than the sum of its proper divisors (2299285).

228920641 is an equidigital number, since it uses as much as digits as its factorization.

228920641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22643 (or 22542 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 228920641 is about 15130.1236280475. The cubic root of 228920641 is about 611.7326364645.

The spelling of 228920641 in words is "two hundred twenty-eight million, nine hundred twenty thousand, six hundred forty-one".