10785721 has 8 divisors (see below), whose sum is σ = 10965024. Its totient is φ = 10608000.

The previous prime is 10785713. The next prime is 10785751. The reversal of 10785721 is 12758701.

It is a happy number.

10785721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 10785721 - 2³ = 10785713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10785751) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24126 + ... + 24568.

It is an arithmetic number, because the mean of its divisors is an integer number (1370628).

Almost surely, 2^10785721 is an apocalyptic number.

It is an amenable number.

10785721 is a deficient number, since it is larger than the sum of its proper divisors (179303).

10785721 is an equidigital number, since it uses as much as digits as its factorization.

10785721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 791.

The product of its (nonzero) digits is 3920, while the sum is 31.

The square root of 10785721 is about 3284.1621458144. The cubic root of 10785721 is about 220.9444316109.

Subtracting from 10785721 its sum of digits (31), we obtain a triangular number (10785690 = T₄₆₄₄).

The spelling of 10785721 in words is "ten million, seven hundred eighty-five thousand, seven hundred twenty-one".