155173320 has 160 divisors (see below), whose sum is σ = 533174400. Its totient is φ = 40459392.

The previous prime is 155173309. The next prime is 155173327. The reversal of 155173320 is 23371551.

155173320 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (155173327) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 151771 + ... + 152789.

It is an arithmetic number, because the mean of its divisors is an integer number (3332340).

Almost surely, 2^155173320 is an apocalyptic number.

155173320 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 155173320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (266587200).

155173320 is an abundant number, since it is smaller than the sum of its proper divisors (378001080).

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

155173320 is a wasteful number, since it uses less digits than its factorization.

155173320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1089 (or 1076 counting only the distinct ones).

The product of its (nonzero) digits is 3150, while the sum is 27.

The square root of 155173320 is about 12456.8583519281. The cubic root of 155173320 is about 537.3686803764.

The spelling of 155173320 in words is "one hundred fifty-five million, one hundred seventy-three thousand, three hundred twenty".