228721382 has 4 divisors (see below), whose sum is σ = 343082076. Its totient is φ = 114360690.

The previous prime is 228721333. The next prime is 228721387. The reversal of 228721382 is 283127822.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 283127822 = 2 ⋅141563911.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228721387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57180344 + ... + 57180347.

It is an arithmetic number, because the mean of its divisors is an integer number (85770519).

Almost surely, 2^228721382 is an apocalyptic number.

228721382 is a deficient number, since it is larger than the sum of its proper divisors (114360694).

228721382 is a wasteful number, since it uses less digits than its factorization.

228721382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114360693.

The product of its digits is 21504, while the sum is 35.

The square root of 228721382 is about 15123.5373507655. The cubic root of 228721382 is about 611.5550951465. Note that the first 3 decimals are identical.

The spelling of 228721382 in words is "two hundred twenty-eight million, seven hundred twenty-one thousand, three hundred eighty-two".