228707720 has 32 divisors (see below), whose sum is σ = 524306520. Its totient is φ = 89756160.

The previous prime is 228707719. The next prime is 228707747. The reversal of 228707720 is 27707822.

It can be written as a sum of positive squares in 4 ways, for example, as 179399236 + 49308484 = 13394^2 + 7022^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51821 + ... + 56060.

Almost surely, 2^228707720 is an apocalyptic number.

228707720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

228707720 is an abundant number, since it is smaller than the sum of its proper divisors (295598800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

228707720 is a wasteful number, since it uses less digits than its factorization.

228707720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107945 (or 107941 counting only the distinct ones).

The product of its (nonzero) digits is 21952, while the sum is 35.

The square root of 228707720 is about 15123.0856639774. The cubic root of 228707720 is about 611.5429184215.

The spelling of 228707720 in words is "two hundred twenty-eight million, seven hundred seven thousand, seven hundred twenty".