27972770261 has 8 divisors (see below), whose sum is σ = 28062652800. Its totient is φ = 27882929088.

The previous prime is 27972770257. The next prime is 27972770279. The reversal of 27972770261 is 16207727972.

It is a happy number.

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 27972770261 - 2² = 27972770257 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27972770251) 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, 1895690 + ... + 1910388.

It is an arithmetic number, because the mean of its divisors is an integer number (3507831600).

Almost surely, 2^27972770261 is an apocalyptic number.

It is an amenable number.

27972770261 is a deficient number, since it is larger than the sum of its proper divisors (89882539).

27972770261 is a wasteful number, since it uses less digits than its factorization.

27972770261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20683.

The product of its (nonzero) digits is 1037232, while the sum is 50.

The spelling of 27972770261 in words is "twenty-seven billion, nine hundred seventy-two million, seven hundred seventy thousand, two hundred sixty-one".