181622428 has 48 divisors (see below), whose sum is σ = 355446784. Its totient is φ = 80637120.

The previous prime is 181622401. The next prime is 181622431. The reversal of 181622428 is 824226181.

It is a junction number, because it is equal to n+sod(n) for n = 181622393 and 181622402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 494701 + ... + 495067.

Almost surely, 2^181622428 is an apocalyptic number.

It is an amenable number.

181622428 is a deficient number, since it is larger than the sum of its proper divisors (173824356).

181622428 is a wasteful number, since it uses less digits than its factorization.

181622428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722 (or 720 counting only the distinct ones).

The product of its digits is 12288, while the sum is 34.

The square root of 181622428 is about 13476.7365485862. The cubic root of 181622428 is about 566.3129494185.

The spelling of 181622428 in words is "one hundred eighty-one million, six hundred twenty-two thousand, four hundred twenty-eight".