16628564 has 6 divisors (see below), whose sum is σ = 29099994. Its totient is φ = 8314280.

The previous prime is 16628561. The next prime is 16628569. The reversal of 16628564 is 46582661.

It can be written as a sum of positive squares in only one way, i.e., 11971600 + 4656964 = 3460^2 + 2158^2 .

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16628561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2078567 + ... + 2078574.

It is an arithmetic number, because the mean of its divisors is an integer number (4849999).

Almost surely, 2^16628564 is an apocalyptic number.

It is an amenable number.

16628564 is a deficient number, since it is larger than the sum of its proper divisors (12471430).

16628564 is a wasteful number, since it uses less digits than its factorization.

16628564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4157145 (or 4157143 counting only the distinct ones).

The product of its digits is 69120, while the sum is 38.

The square root of 16628564 is about 4077.8136298757. The cubic root of 16628564 is about 255.2416727183.

The spelling of 16628564 in words is "sixteen million, six hundred twenty-eight thousand, five hundred sixty-four".