228131772 has 48 divisors (see below), whose sum is σ = 614863872. Its totient is φ = 65063680.

The previous prime is 228131767. The next prime is 228131801. The reversal of 228131772 is 277131822.

228131772 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48588 + ... + 53075.

It is an arithmetic number, because the mean of its divisors is an integer number (12809664).

Almost surely, 2^228131772 is an apocalyptic number.

228131772 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

228131772 is an abundant number, since it is smaller than the sum of its proper divisors (386732100).

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

228131772 is a wasteful number, since it uses less digits than its factorization.

228131772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101698 (or 101696 counting only the distinct ones).

The product of its digits is 9408, while the sum is 33.

The square root of 228131772 is about 15104.0316472126. The cubic root of 228131772 is about 611.0291433227.

Subtracting 228131772 from its reverse (277131822), we obtain a triangular number (49000050 = T₉₈₉₉).

The spelling of 228131772 in words is "two hundred twenty-eight million, one hundred thirty-one thousand, seven hundred seventy-two".