228121692 has 12 divisors (see below), whose sum is σ = 532283976. Its totient is φ = 76040560.

The previous prime is 228121637. The next prime is 228121693. The reversal of 228121692 is 296121822.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228121693) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9505059 + ... + 9505082.

It is an arithmetic number, because the mean of its divisors is an integer number (44356998).

Almost surely, 2^228121692 is an apocalyptic number.

It is an amenable number.

228121692 is an abundant number, since it is smaller than the sum of its proper divisors (304162284).

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

228121692 is a wasteful number, since it uses less digits than its factorization.

228121692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19010148 (or 19010146 counting only the distinct ones).

The product of its digits is 6912, while the sum is 33.

The square root of 228121692 is about 15103.6979577850. The cubic root of 228121692 is about 611.0201437514.

The spelling of 228121692 in words is "two hundred twenty-eight million, one hundred twenty-one thousand, six hundred ninety-two".