27211636840 has 32 divisors (see below), whose sum is σ = 64827724680. Its totient is φ = 10244380672.

The previous prime is 27211636831. The next prime is 27211636849. The reversal of 27211636840 is 4863611272.

It is an interprime number because it is at equal distance from previous prime (27211636831) and next prime (27211636849).

It can be written as a sum of positive squares in 4 ways, for example, as 22927410724 + 4284226116 = 151418^2 + 65454^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 27211636793 and 27211636802.

It is not an unprimeable number, because it can be changed into a prime (27211636849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20007877 + ... + 20009236.

Almost surely, 2^27211636840 is an apocalyptic number.

27211636840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27211636840 is an abundant number, since it is smaller than the sum of its proper divisors (37616087840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27211636840 is a wasteful number, since it uses less digits than its factorization.

27211636840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40017141 (or 40017137 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 40.

The spelling of 27211636840 in words is "twenty-seven billion, two hundred eleven million, six hundred thirty-six thousand, eight hundred forty".