228721370 has 16 divisors (see below), whose sum is σ = 421740648. Its totient is φ = 89256960.

The previous prime is 228721333. The next prime is 228721387. The reversal of 228721370 is 73127822.

It can be written as a sum of positive squares in 4 ways, for example, as 128300929 + 100420441 = 11327^2 + 10021^2 .

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, 278519 + ... + 279338.

Almost surely, 2^228721370 is an apocalyptic number.

228721370 is a deficient number, since it is larger than the sum of its proper divisors (193019278).

228721370 is a wasteful number, since it uses less digits than its factorization.

228721370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557905.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 228721370 is about 15123.5369540329. The cubic root of 228721370 is about 611.5550844513. Note that the first 3 decimals are identical.

It can be divided in two parts, 22872 and 1370, that added together give a palindrome (24242).

The spelling of 228721370 in words is "two hundred twenty-eight million, seven hundred twenty-one thousand, three hundred seventy".