8721696 has 48 divisors (see below), whose sum is σ = 23393664. Its totient is φ = 2843904.

The previous prime is 8721673. The next prime is 8721701. The reversal of 8721696 is 6961278.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×8721696² = 152135962232832, which contains 22 as substring.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3546 + ... + 5478.

It is an arithmetic number, because the mean of its divisors is an integer number (487368).

Almost surely, 2^8721696 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 8721696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11696832).

8721696 is an abundant number, since it is smaller than the sum of its proper divisors (14671968).

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

8721696 is a wasteful number, since it uses less digits than its factorization.

8721696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1993 (or 1985 counting only the distinct ones).

The product of its digits is 36288, while the sum is 39.

The square root of 8721696 is about 2953.2517671204. The cubic root of 8721696 is about 205.8418366819.

The spelling of 8721696 in words is "eight million, seven hundred twenty-one thousand, six hundred ninety-six".