16628720 has 40 divisors (see below), whose sum is σ = 40939344. Its totient is φ = 6259712.

The previous prime is 16628719. The next prime is 16628723. The reversal of 16628720 is 2782661.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16628723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4754 + ... + 7473.

Almost surely, 2^16628720 is an apocalyptic number.

16628720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16628720 is an abundant number, since it is smaller than the sum of its proper divisors (24310624).

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

16628720 is a wasteful number, since it uses less digits than its factorization.

16628720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12257 (or 12251 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 16628720 is about 4077.8327577281. The cubic root of 16628720 is about 255.2424708946.

The spelling of 16628720 in words is "sixteen million, six hundred twenty-eight thousand, seven hundred twenty".