228640247 has 8 divisors (see below), whose sum is σ = 253149312. Its totient is φ = 204751800.

The previous prime is 228640219. The next prime is 228640249. The reversal of 228640247 is 742046822.

It is a happy number.

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

It is not a de Polignac number, because 228640247 - 2⁸ = 228639991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228640249) 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, 154379 + ... + 155852.

It is an arithmetic number, because the mean of its divisors is an integer number (31643664).

Almost surely, 2^228640247 is an apocalyptic number.

228640247 is a deficient number, since it is larger than the sum of its proper divisors (24509065).

228640247 is a wasteful number, since it uses less digits than its factorization.

228640247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310309.

The product of its (nonzero) digits is 43008, while the sum is 35.

The square root of 228640247 is about 15120.8547046786. The cubic root of 228640247 is about 611.4827736893.

The spelling of 228640247 in words is "two hundred twenty-eight million, six hundred forty thousand, two hundred forty-seven".