155500800 has 432 divisors, whose sum is σ = 638709120. Its totient is φ = 32440320.

The previous prime is 155500759. The next prime is 155500801. The reversal of 155500800 is 8005551.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155500801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1747156 + ... + 1747244.

Almost surely, 2^155500800 is an apocalyptic number.

155500800 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 155500800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (319354560).

155500800 is an abundant number, since it is smaller than the sum of its proper divisors (483208320).

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

155500800 is a wasteful number, since it uses less digits than its factorization.

155500800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138 (or 119 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 24.

The square root of 155500800 is about 12469.9959903763. The cubic root of 155500800 is about 537.7464382823.

The spelling of 155500800 in words is "one hundred fifty-five million, five hundred thousand, eight hundred".