10721646 has 48 divisors (see below), whose sum is σ = 25959024. Its totient is φ = 3297024.

The previous prime is 10721621. The next prime is 10721653. The reversal of 10721646 is 64612701.

10721646 is a `hidden beast` number, since 10 + 7 + 2 + 1 + 646 = 666.

It is a super-2 number, since 2×10721646² = 229907385898632, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5470 + ... + 7166.

It is an arithmetic number, because the mean of its divisors is an integer number (540813).

Almost surely, 2^10721646 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 10721646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12979512).

10721646 is an abundant number, since it is smaller than the sum of its proper divisors (15237378).

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

10721646 is a wasteful number, since it uses less digits than its factorization.

10721646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1727 (or 1715 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 10721646 is about 3274.3924627326. The cubic root of 10721646 is about 220.5060389850.

The spelling of 10721646 in words is "ten million, seven hundred twenty-one thousand, six hundred forty-six".