155506120 has 128 divisors (see below), whose sum is σ = 451526400. Its totient is φ = 46771200.

The previous prime is 155506063. The next prime is 155506121. The reversal of 155506120 is 21605551.

It is not an unprimeable number, because it can be changed into a prime (155506121) 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, 88450 + ... + 90190.

It is an arithmetic number, because the mean of its divisors is an integer number (3527550).

Almost surely, 2^155506120 is an apocalyptic number.

155506120 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 155506120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (225763200).

155506120 is an abundant number, since it is smaller than the sum of its proper divisors (296020280).

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

155506120 is a wasteful number, since it uses less digits than its factorization.

155506120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1799 (or 1795 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 155506120 is about 12470.2093005691. The cubic root of 155506120 is about 537.7525706804.

The spelling of 155506120 in words is "one hundred fifty-five million, five hundred six thousand, one hundred twenty".