228021705 has 48 divisors (see below), whose sum is σ = 410666256. Its totient is φ = 116951040.

The previous prime is 228021671. The next prime is 228021719. The reversal of 228021705 is 507120822.

It can be written as a sum of positive squares in 8 ways, for example, as 31236921 + 196784784 = 5589^2 + 14028^2 .

It is not a de Polignac number, because 228021705 - 2⁸ = 228021449 is a prime.

It is a super-2 number, since 2×228021705² = 103987795902214050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 133839 + ... + 135531.

It is an arithmetic number, because the mean of its divisors is an integer number (8555547).

Almost surely, 2^228021705 is an apocalyptic number.

It is an amenable number.

228021705 is a deficient number, since it is larger than the sum of its proper divisors (182644551).

228021705 is a wasteful number, since it uses less digits than its factorization.

228021705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1818 (or 1815 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 228021705 is about 15100.3875778074. The cubic root of 228021705 is about 610.9308595354.

The spelling of 228021705 in words is "two hundred twenty-eight million, twenty-one thousand, seven hundred five".