155223320 has 64 divisors (see below), whose sum is σ = 416517120. Its totient is φ = 50903424.

The previous prime is 155223307. The next prime is 155223323. The reversal of 155223320 is 23322551.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155223323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5612 + ... + 18491.

It is an arithmetic number, because the mean of its divisors is an integer number (6508080).

Almost surely, 2^155223320 is an apocalyptic number.

155223320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155223320 is an abundant number, since it is smaller than the sum of its proper divisors (261293800).

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

155223320 is a wasteful number, since it uses less digits than its factorization.

155223320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24144 (or 24140 counting only the distinct ones).

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

The square root of 155223320 is about 12458.8651168555. The cubic root of 155223320 is about 537.4263912180.

Adding to 155223320 its reverse (23322551), we get a palindrome (178545871).

The spelling of 155223320 in words is "one hundred fifty-five million, two hundred twenty-three thousand, three hundred twenty".