155220330 has 64 divisors (see below), whose sum is σ = 390832128. Its totient is φ = 39378240.

The previous prime is 155220313. The next prime is 155220337. The reversal of 155220330 is 33022551.

It is a super-3 number, since 3×155220330³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 155220297 and 155220306.

It is not an unprimeable number, because it can be changed into a prime (155220337) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 156135 + ... + 157125.

It is an arithmetic number, because the mean of its divisors is an integer number (6106752).

Almost surely, 2^155220330 is an apocalyptic number.

155220330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 155220330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (195416064).

155220330 is an abundant number, since it is smaller than the sum of its proper divisors (235611798).

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

155220330 is a wasteful number, since it uses less digits than its factorization.

155220330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1251.

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 155220330 is about 12458.7451213997. The cubic root of 155220330 is about 537.4229404581.

Adding to 155220330 its reverse (33022551), we get a palindrome (188242881).

The spelling of 155220330 in words is "one hundred fifty-five million, two hundred twenty thousand, three hundred thirty".