155021328 has 360 divisors, whose sum is σ = 576296448. Its totient is φ = 38016000.

The previous prime is 155021303. The next prime is 155021381. The reversal of 155021328 is 823120551.

It is a happy number.

It is a super-2 number, since 2×155021328² = 48063224269767168, which contains 22 as substring.

It is a congruent number.

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 71 ways as a sum of consecutive naturals, for example, 3780988 + ... + 3781028.

Almost surely, 2^155021328 is an apocalyptic number.

155021328 is a gapful number since it is divisible by the number (18) 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 155021328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (288148224).

155021328 is an abundant number, since it is smaller than the sum of its proper divisors (421275120).

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

155021328 is a wasteful number, since it uses less digits than its factorization.

155021328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115 (or 95 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 155021328 is about 12450.7561216177. The cubic root of 155021328 is about 537.1931724947.

Adding to 155021328 its reverse (823120551), we get a palindrome (978141879).

The spelling of 155021328 in words is "one hundred fifty-five million, twenty-one thousand, three hundred twenty-eight".