10000781 has 8 divisors (see below), whose sum is σ = 11586624. Its totient is φ = 8454240.

The previous prime is 10000769. The next prime is 10000789. The reversal of 10000781 is 18700001.

10000781 is digitally balanced in base 3, 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 10000781 - 2¹⁴ = 9984397 is a prime.

It is a super-2 number, since 2×10000781² = 200031241219922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10000789) 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, 9275 + ... + 10296.

It is an arithmetic number, because the mean of its divisors is an integer number (1448328).

Almost surely, 2^10000781 is an apocalyptic number.

It is an amenable number.

10000781 is a deficient number, since it is larger than the sum of its proper divisors (1585843).

10000781 is an equidigital number, since it uses as much as digits as its factorization.

10000781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19651.

The product of its (nonzero) digits is 56, while the sum is 17.

The square root of 10000781 is about 3162.4011447000. The cubic root of 10000781 is about 215.4490775688.

Adding to 10000781 its reverse (18700001), we get a palindrome (28700782).

The spelling of 10000781 in words is "ten million, seven hundred eighty-one", and thus it is an aban number.