155744240 has 80 divisors (see below), whose sum is σ = 375350976. Its totient is φ = 60057600.

The previous prime is 155744233. The next prime is 155744243. The reversal of 155744240 is 42447551.

155744240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-3 number, since 3×155744240³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 155744197 and 155744206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155744243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 337610 + ... + 338070.

Almost surely, 2^155744240 is an apocalyptic number.

155744240 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 155744240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (187675488).

155744240 is an abundant number, since it is smaller than the sum of its proper divisors (219606736).

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

155744240 is a wasteful number, since it uses less digits than its factorization.

155744240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 618 (or 612 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 32.

The square root of 155744240 is about 12479.7532026879. The cubic root of 155744240 is about 538.0269100197.

The spelling of 155744240 in words is "one hundred fifty-five million, seven hundred forty-four thousand, two hundred forty".