16781696 has 32 divisors (see below), whose sum is σ = 34221000. Its totient is φ = 8193024.

The previous prime is 16781671. The next prime is 16781701. The reversal of 16781696 is 69618761.

It is a tau number, because it is divible by the number of its divisors (32).

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3980 + ... + 7028.

Almost surely, 2^16781696 is an apocalyptic number.

16781696 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16781696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17110500).

16781696 is an abundant number, since it is smaller than the sum of its proper divisors (17439304).

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

16781696 is an equidigital number, since it uses as much as digits as its factorization.

16781696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3106 (or 3094 counting only the distinct ones).

The product of its digits is 108864, while the sum is 44.

The square root of 16781696 is about 4096.5468384970. The cubic root of 16781696 is about 256.0227844304.

The spelling of 16781696 in words is "sixteen million, seven hundred eighty-one thousand, six hundred ninety-six".