155809228 has 12 divisors (see below), whose sum is σ = 282068640. Its totient is φ = 75218192.

The previous prime is 155809217. The next prime is 155809261. The reversal of 155809228 is 822908551.

155809228 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 671476 + ... + 671707.

It is an arithmetic number, because the mean of its divisors is an integer number (23505720).

Almost surely, 2^155809228 is an apocalyptic number.

It is an amenable number.

155809228 is a deficient number, since it is larger than the sum of its proper divisors (126259412).

155809228 is a wasteful number, since it uses less digits than its factorization.

155809228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1343216 (or 1343214 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 40.

The square root of 155809228 is about 12482.3566685142. The cubic root of 155809228 is about 538.1017344682.

The spelling of 155809228 in words is "one hundred fifty-five million, eight hundred nine thousand, two hundred twenty-eight".