16628257 has 2 divisors, whose sum is σ = 16628258. Its totient is φ = 16628256.

The previous prime is 16628243. The next prime is 16628263. The reversal of 16628257 is 75282661.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12503296 + 4124961 = 3536^2 + 2031^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16628257 is a prime.

It is a Chen prime.

It is a nialpdrome in base 16.

It is not a weakly prime, because it can be changed into another prime (16622257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8314128 + 8314129.

It is an arithmetic number, because the mean of its divisors is an integer number (8314129).

Almost surely, 2^16628257 is an apocalyptic number.

It is an amenable number.

16628257 is a deficient number, since it is larger than the sum of its proper divisors (1).

16628257 is an equidigital number, since it uses as much as digits as its factorization.

16628257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 37.

The square root of 16628257 is about 4077.7759869811. The cubic root of 16628257 is about 255.2401019337.

The spelling of 16628257 in words is "sixteen million, six hundred twenty-eight thousand, two hundred fifty-seven".