30921696 has 96 divisors (see below), whose sum is σ = 97161120. Its totient is φ = 9510912.

The previous prime is 30921661. The next prime is 30921697. The reversal of 30921696 is 69612903.

It is a tau number, because it is divible by the number of its divisors (96).

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

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

It is a self number, because there is not a number n which added to its sum of digits gives 30921696.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30921697) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9856 + ... + 12608.

It is an arithmetic number, because the mean of its divisors is an integer number (1012095).

Almost surely, 2^30921696 is an apocalyptic number.

30921696 is a gapful number since it is divisible by the number (36) 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 30921696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48580560).

30921696 is an abundant number, since it is smaller than the sum of its proper divisors (66239424).

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

30921696 is a wasteful number, since it uses less digits than its factorization.

30921696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2785 (or 2771 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 30921696 is about 5560.7280098922. The cubic root of 30921696 is about 313.8733447296.

The spelling of 30921696 in words is "thirty million, nine hundred twenty-one thousand, six hundred ninety-six".