16628231 has 4 divisors (see below), whose sum is σ = 16687272. Its totient is φ = 16569192.

The previous prime is 16628221. The next prime is 16628233. The reversal of 16628231 is 13282661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16628231 is a prime.

It is a super-2 number, since 2×16628231² = 552996132378722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16628194 and 16628203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16628233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29096 + ... + 29661.

It is an arithmetic number, because the mean of its divisors is an integer number (4171818).

Almost surely, 2^16628231 is an apocalyptic number.

16628231 is a deficient number, since it is larger than the sum of its proper divisors (59041).

16628231 is an equidigital number, since it uses as much as digits as its factorization.

16628231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59040.

The product of its digits is 3456, while the sum is 29.

The square root of 16628231 is about 4077.7727989676. The cubic root of 16628231 is about 255.2399689022.

The spelling of 16628231 in words is "sixteen million, six hundred twenty-eight thousand, two hundred thirty-one".