155906784 has 144 divisors (see below), whose sum is σ = 500638320. Its totient is φ = 45588480.

The previous prime is 155906783. The next prime is 155906801. The reversal of 155906784 is 487609551.

155906784 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155906783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 91024 + ... + 92720.

It is an arithmetic number, because the mean of its divisors is an integer number (3476655).

Almost surely, 2^155906784 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155906784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (250319160).

155906784 is an abundant number, since it is smaller than the sum of its proper divisors (344731536).

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

155906784 is a wasteful number, since it uses less digits than its factorization.

155906784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1753 (or 1742 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

The square root of 155906784 is about 12486.2638126863. The cubic root of 155906784 is about 538.2140172924.

The spelling of 155906784 in words is "one hundred fifty-five million, nine hundred six thousand, seven hundred eighty-four".