155623424 has 84 divisors (see below), whose sum is σ = 344272362. Its totient is φ = 70287360.

The previous prime is 155623343. The next prime is 155623453. The reversal of 155623424 is 424326551.

It can be written as a sum of positive squares in only one way, i.e., 143233024 + 12390400 = 11968^2 + 3520^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 991154 + ... + 991310.

Almost surely, 2^155623424 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 155623424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (172136181).

155623424 is an abundant number, since it is smaller than the sum of its proper divisors (188648938).

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

155623424 is an equidigital number, since it uses as much as digits as its factorization.

155623424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205 (or 170 counting only the distinct ones).

The product of its digits is 28800, while the sum is 32.

The square root of 155623424 is about 12474.9117832552. The cubic root of 155623424 is about 537.8877522258.

Adding to 155623424 its reverse (424326551), we get a palindrome (579949975).

The spelling of 155623424 in words is "one hundred fifty-five million, six hundred twenty-three thousand, four hundred twenty-four".