228197788 has 24 divisors (see below), whose sum is σ = 491503712. Its totient is φ = 90275904.

The previous prime is 228197747. The next prime is 228197797. The reversal of 228197788 is 887791822.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 313095 + ... + 313822.

Almost surely, 2^228197788 is an apocalyptic number.

228197788 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

228197788 is an abundant number, since it is smaller than the sum of its proper divisors (263305924).

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

228197788 is a wasteful number, since it uses less digits than its factorization.

228197788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626941 (or 626939 counting only the distinct ones).

The product of its digits is 903168, while the sum is 52.

The square root of 228197788 is about 15106.2168659132. The cubic root of 228197788 is about 611.0880768202.

The spelling of 228197788 in words is "two hundred twenty-eight million, one hundred ninety-seven thousand, seven hundred eighty-eight".