155233220 has 12 divisors (see below), whose sum is σ = 325989804. Its totient is φ = 62093280.

The previous prime is 155233207. The next prime is 155233231. The reversal of 155233220 is 22332551.

It can be written as a sum of positive squares in 2 ways, for example, as 73547776 + 81685444 = 8576^2 + 9038^2 .

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 3 ways as a sum of consecutive naturals, for example, 3880811 + ... + 3880850.

It is an arithmetic number, because the mean of its divisors is an integer number (27165817).

Almost surely, 2^155233220 is an apocalyptic number.

155233220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155233220 is an abundant number, since it is smaller than the sum of its proper divisors (170756584).

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

155233220 is a wasteful number, since it uses less digits than its factorization.

155233220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7761670 (or 7761668 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 155233220 is about 12459.2624179764. The cubic root of 155233220 is about 537.4378164947.

Adding to 155233220 its reverse (22332551), we get a palindrome (177565771).

The spelling of 155233220 in words is "one hundred fifty-five million, two hundred thirty-three thousand, two hundred twenty".