155203880 has 128 divisors (see below), whose sum is σ = 404520480. Its totient is φ = 53084160.

The previous prime is 155203879. The next prime is 155203891. The reversal of 155203880 is 88302551.

It is a happy number.

It can be written as a sum of positive squares in 16 ways, for example, as 1295044 + 153908836 = 1138^2 + 12406^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 857390 + ... + 857570.

Almost surely, 2^155203880 is an apocalyptic number.

155203880 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 155203880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (202260240).

155203880 is an abundant number, since it is smaller than the sum of its proper divisors (249316600).

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

155203880 is a wasteful number, since it uses less digits than its factorization.

155203880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319 (or 315 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 155203880 is about 12458.0849250597. The cubic root of 155203880 is about 537.4039547155.

It can be divided in two parts, 15520 and 3880, that multiplied together give a square (60217600 = 7760²).

The spelling of 155203880 in words is "one hundred fifty-five million, two hundred three thousand, eight hundred eighty".