27490634809 has 9 divisors (see below), whose sum is σ = 30218983599. Its totient is φ = 24989828160.

The previous prime is 27490634779. The next prime is 27490634837. The reversal of 27490634809 is 90843609472.

It is a happy number.

The square root of 27490634809 is 165803.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 13251463225 + 14239171584 = 115115^2 + 119328^2 .

It is not a de Polignac number, because 27490634809 - 2⁵ = 27490634777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27490634869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1816297 + ... + 1831369.

Almost surely, 2^27490634809 is an apocalyptic number.

27490634809 is the 165803-rd square number.

27490634809 is the 82902-nd centered octagonal number.

It is an amenable number.

27490634809 is a deficient number, since it is larger than the sum of its proper divisors (2728348790).

27490634809 is an frugal number, since it uses more digits than its factorization.

27490634809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30168 (or 15084 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 52.

The spelling of 27490634809 in words is "twenty-seven billion, four hundred ninety million, six hundred thirty-four thousand, eight hundred nine".