155438568 has 64 divisors (see below), whose sum is σ = 439128000. Its totient is φ = 50930496.

The previous prime is 155438567. The next prime is 155438573. The reversal of 155438568 is 865834551.

155438568 is a `hidden beast` number, since 1 + 5 + 54 + 38 + 568 = 666.

155438568 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×155438568² = 48322296843781248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (155438561) 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, 6646 + ... + 18842.

It is an arithmetic number, because the mean of its divisors is an integer number (6861375).

Almost surely, 2^155438568 is an apocalyptic number.

155438568 is a gapful number since it is divisible by the number (18) 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 155438568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (219564000).

155438568 is an abundant number, since it is smaller than the sum of its proper divisors (283689432).

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

155438568 is a wasteful number, since it uses less digits than its factorization.

155438568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12271 (or 12261 counting only the distinct ones).

The product of its digits is 576000, while the sum is 45.

The square root of 155438568 is about 12467.5004712252. The cubic root of 155438568 is about 537.6746926672.

The spelling of 155438568 in words is "one hundred fifty-five million, four hundred thirty-eight thousand, five hundred sixty-eight".