155781560 has 64 divisors (see below), whose sum is σ = 383685120. Its totient is φ = 56453760.

The previous prime is 155781529. The next prime is 155781569. The reversal of 155781560 is 65187551.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155781569) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 213917 + ... + 214643.

It is an arithmetic number, because the mean of its divisors is an integer number (5995080).

Almost surely, 2^155781560 is an apocalyptic number.

155781560 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 155781560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (191842560).

155781560 is an abundant number, since it is smaller than the sum of its proper divisors (227903560).

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

155781560 is a wasteful number, since it uses less digits than its factorization.

155781560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1236 (or 1232 counting only the distinct ones).

The product of its (nonzero) digits is 42000, while the sum is 38.

The square root of 155781560 is about 12481.2483350024. The cubic root of 155781560 is about 538.0698812411.

The spelling of 155781560 in words is "one hundred fifty-five million, seven hundred eighty-one thousand, five hundred sixty".