228642649 has 4 divisors (see below), whose sum is σ = 231863040. Its totient is φ = 225422260.

The previous prime is 228642611. The next prime is 228642709. The reversal of 228642649 is 946246822.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 946246822 = 2 ⋅473123411.

It is a cyclic number.

It is not a de Polignac number, because 228642649 - 2²⁵ = 195088217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228642049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1610089 + ... + 1610230.

It is an arithmetic number, because the mean of its divisors is an integer number (57965760).

Almost surely, 2^228642649 is an apocalyptic number.

It is an amenable number.

228642649 is a deficient number, since it is larger than the sum of its proper divisors (3220391).

228642649 is an equidigital number, since it uses as much as digits as its factorization.

228642649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3220390.

The product of its digits is 331776, while the sum is 43.

The square root of 228642649 is about 15120.9341311971. The cubic root of 228642649 is about 611.4849150103.

The spelling of 228642649 in words is "two hundred twenty-eight million, six hundred forty-two thousand, six hundred forty-nine".