27690485731 has 4 divisors (see below), whose sum is σ = 27691493200. Its totient is φ = 27689478264.

The previous prime is 27690485723. The next prime is 27690485743. The reversal of 27690485731 is 13758409672.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 27690485731 - 2³ = 27690485723 is a prime.

It is a super-2 number, since 2×27690485731² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27690485131) 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, 461316 + ... + 517873.

It is an arithmetic number, because the mean of its divisors is an integer number (6922873300).

It is a 2-persistent number, because it is pandigital, and so is 2⋅27690485731 = 55380971462, but 3⋅27690485731 = 83071457193 is not.

Almost surely, 2^27690485731 is an apocalyptic number.

27690485731 is the 105244-th centered pentagonal number.

27690485731 is a deficient number, since it is larger than the sum of its proper divisors (1007469).

27690485731 is an equidigital number, since it uses as much as digits as its factorization.

27690485731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1007468.

The product of its (nonzero) digits is 2540160, while the sum is 52.

The spelling of 27690485731 in words is "twenty-seven billion, six hundred ninety million, four hundred eighty-five thousand, seven hundred thirty-one".