155638228 has 12 divisors (see below), whose sum is σ = 281153152. Its totient is φ = 75308760.

The previous prime is 155638211. The next prime is 155638229. The reversal of 155638228 is 822836551.

155638228 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155638229) 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, 627450 + ... + 627697.

Almost surely, 2^155638228 is an apocalyptic number.

It is an amenable number.

155638228 is a deficient number, since it is larger than the sum of its proper divisors (125514924).

155638228 is a wasteful number, since it uses less digits than its factorization.

155638228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1255182 (or 1255180 counting only the distinct ones).

The product of its digits is 115200, while the sum is 40.

The square root of 155638228 is about 12475.5051200342. The cubic root of 155638228 is about 537.9048075799.

The spelling of 155638228 in words is "one hundred fifty-five million, six hundred thirty-eight thousand, two hundred twenty-eight".