11672781 has 4 divisors (see below), whose sum is σ = 15563712. Its totient is φ = 7781852.

The previous prime is 11672767. The next prime is 11672789. The reversal of 11672781 is 18727611.

11672781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11672781 - 2¹¹ = 11670733 is a prime.

It is a super-2 number, since 2×11672781² = 272507632547922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11672789) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1945461 + ... + 1945466.

It is an arithmetic number, because the mean of its divisors is an integer number (3890928).

Almost surely, 2^11672781 is an apocalyptic number.

It is an amenable number.

11672781 is a deficient number, since it is larger than the sum of its proper divisors (3890931).

11672781 is an equidigital number, since it uses as much as digits as its factorization.

11672781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3890930.

The product of its digits is 4704, while the sum is 33.

The square root of 11672781 is about 3416.5451848322. The cubic root of 11672781 is about 226.8426850285.

The spelling of 11672781 in words is "eleven million, six hundred seventy-two thousand, seven hundred eighty-one".