155228100 has 144 divisors (see below), whose sum is σ = 478927680. Its totient is φ = 38707200.

The previous prime is 155228089. The next prime is 155228113. The reversal of 155228100 is 1822551.

155228100 is digitally balanced in base 3 and base 9, because in such bases it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×155228100² = 48191526059220000, which contains 22 as substring.

155228100 is strictly pandigital in base 9.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 643980 + ... + 644220.

Almost surely, 2^155228100 is an apocalyptic number.

155228100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155228100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (239463840).

155228100 is an abundant number, since it is smaller than the sum of its proper divisors (323699580).

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

155228100 is a wasteful number, since it uses less digits than its factorization.

155228100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390 (or 383 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 24.

The square root of 155228100 is about 12459.0569466553. The cubic root of 155228100 is about 537.4319077254.

The spelling of 155228100 in words is "one hundred fifty-five million, two hundred twenty-eight thousand, one hundred".