17428720 has 20 divisors (see below), whose sum is σ = 40521960. Its totient is φ = 6971456.

The previous prime is 17428673. The next prime is 17428753. The reversal of 17428720 is 2782471.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108850 + ... + 109009.

It is an arithmetic number, because the mean of its divisors is an integer number (2026098).

Almost surely, 2^17428720 is an apocalyptic number.

17428720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

17428720 is an abundant number, since it is smaller than the sum of its proper divisors (23093240).

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

17428720 is a wasteful number, since it uses less digits than its factorization.

17428720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217872 (or 217866 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 17428720 is about 4174.7718500536. The cubic root of 17428720 is about 259.2717292465.

The spelling of 17428720 in words is "seventeen million, four hundred twenty-eight thousand, seven hundred twenty".