155864250 has 160 divisors (see below), whose sum is σ = 448493760. Its totient is φ = 40370400.

The previous prime is 155864243. The next prime is 155864251. The reversal of 155864250 is 52468551.

155864250 is a `hidden beast` number, since 1 + 5 + 5 + 8 + 642 + 5 + 0 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155864251) 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 79 ways as a sum of consecutive naturals, for example, 870661 + ... + 870839.

It is an arithmetic number, because the mean of its divisors is an integer number (2803086).

Almost surely, 2^155864250 is an apocalyptic number.

155864250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 155864250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (224246880).

155864250 is an abundant number, since it is smaller than the sum of its proper divisors (292629510).

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

155864250 is a wasteful number, since it uses less digits than its factorization.

155864250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251 (or 232 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 36.

The square root of 155864250 is about 12484.5604648301. The cubic root of 155864250 is about 538.1650682205.

The spelling of 155864250 in words is "one hundred fifty-five million, eight hundred sixty-four thousand, two hundred fifty".