16427664 has 80 divisors (see below), whose sum is σ = 51455040. Its totient is φ = 4976640.

The previous prime is 16427639. The next prime is 16427687. The reversal of 16427664 is 46672461.

16427664 is a `hidden beast` number, since 1 + 642 + 7 + 6 + 6 + 4 = 666.

16427664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nialpdrome in base 4 and base 16.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3024 + ... + 6480.

It is an arithmetic number, because the mean of its divisors is an integer number (643188).

Almost surely, 2^16427664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16427664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25727520).

16427664 is an abundant number, since it is smaller than the sum of its proper divisors (35027376).

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

16427664 is a wasteful number, since it uses less digits than its factorization.

16427664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3485 (or 3473 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The square root of 16427664 is about 4053.1054760517. The cubic root of 16427664 is about 254.2095940871.

The spelling of 16427664 in words is "sixteen million, four hundred twenty-seven thousand, six hundred sixty-four".