10687721 has 8 divisors (see below), whose sum is σ = 11714304. Its totient is φ = 9670320.

The previous prime is 10687687. The next prime is 10687727. The reversal of 10687721 is 12778601.

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

It is not a de Polignac number, because 10687721 - 2⁶ = 10687657 is a prime.

It is a super-2 number, since 2×10687721² = 228454760347682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10687727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 275 + ... + 4631.

It is an arithmetic number, because the mean of its divisors is an integer number (1464288).

Almost surely, 2^10687721 is an apocalyptic number.

10687721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10687721 is a deficient number, since it is larger than the sum of its proper divisors (1026583).

10687721 is a wasteful number, since it uses less digits than its factorization.

10687721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4591.

The product of its (nonzero) digits is 4704, while the sum is 32.

The square root of 10687721 is about 3269.2080080656. The cubic root of 10687721 is about 220.2732211483.

The spelling of 10687721 in words is "ten million, six hundred eighty-seven thousand, seven hundred twenty-one".