155530240 has 88 divisors (see below), whose sum is σ = 383640552. Its totient is φ = 60456960.

The previous prime is 155530231. The next prime is 155530253. The reversal of 155530240 is 42035551.

It can be written as a sum of positive squares in 4 ways, for example, as 27206656 + 128323584 = 5216^2 + 11328^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 189030 + ... + 189850.

Almost surely, 2^155530240 is an apocalyptic number.

155530240 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 155530240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (191820276).

155530240 is an abundant number, since it is smaller than the sum of its proper divisors (228110312).

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

155530240 is an equidigital number, since it uses as much as digits as its factorization.

155530240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 883 (or 865 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 155530240 is about 12471.1763679294. The cubic root of 155530240 is about 537.7803722045.

Adding to 155530240 its reverse (42035551), we get a palindrome (197565791).

The spelling of 155530240 in words is "one hundred fifty-five million, five hundred thirty thousand, two hundred forty".