155171880 has 96 divisors (see below), whose sum is σ = 516657960. Its totient is φ = 40366080.

The previous prime is 155171873. The next prime is 155171881. The reversal of 155171880 is 88171551.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 28068804 + 127103076 = 5298^2 + 11274^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (155171881) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9504 + ... + 20016.

Almost surely, 2^155171880 is an apocalyptic number.

155171880 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 155171880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (258328980).

155171880 is an abundant number, since it is smaller than the sum of its proper divisors (361486080).

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

155171880 is a wasteful number, since it uses less digits than its factorization.

155171880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10571 (or 10564 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 36.

The square root of 155171880 is about 12456.8005523088. The cubic root of 155171880 is about 537.3670181205.

The spelling of 155171880 in words is "one hundred fifty-five million, one hundred seventy-one thousand, eight hundred eighty".