228403720 has 32 divisors (see below), whose sum is σ = 514422720. Its totient is φ = 91270080.

The previous prime is 228403717. The next prime is 228403733. The reversal of 228403720 is 27304822.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49429 + ... + 53851.

It is an arithmetic number, because the mean of its divisors is an integer number (16075710).

Almost surely, 2^228403720 is an apocalyptic number.

228403720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

228403720 is an abundant number, since it is smaller than the sum of its proper divisors (286019000).

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

228403720 is a wasteful number, since it uses less digits than its factorization.

228403720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5725 (or 5721 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 228403720 is about 15113.0314629461. The cubic root of 228403720 is about 611.2718424843.

The spelling of 228403720 in words is "two hundred twenty-eight million, four hundred three thousand, seven hundred twenty".