155642224 has 40 divisors (see below), whose sum is σ = 321943680. Its totient is φ = 72676800.

The previous prime is 155642213. The next prime is 155642233. The reversal of 155642224 is 422246551.

It is a super-3 number, since 3×155642224³ (a number of 26 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 17979 + ... + 25189.

It is an arithmetic number, because the mean of its divisors is an integer number (8048592).

Almost surely, 2^155642224 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155642224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (160971840).

155642224 is an abundant number, since it is smaller than the sum of its proper divisors (166301456).

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

155642224 is a wasteful number, since it uses less digits than its factorization.

155642224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7309 (or 7303 counting only the distinct ones).

The product of its digits is 19200, while the sum is 31.

The square root of 155642224 is about 12475.6652728422. The cubic root of 155642224 is about 537.9094110959.

Adding to 155642224 its reverse (422246551), we get a palindrome (577888775).

The spelling of 155642224 in words is "one hundred fifty-five million, six hundred forty-two thousand, two hundred twenty-four".