27972606991 has 16 divisors (see below), whose sum is σ = 33014181888. Its totient is φ = 23193072000.

The previous prime is 27972606989. The next prime is 27972607031. The reversal of 27972606991 is 19960627972.

It is not a de Polignac number, because 27972606991 - 2¹ = 27972606989 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 (27972606901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 499191 + ... + 552391.

It is an arithmetic number, because the mean of its divisors is an integer number (2063386368).

Almost surely, 2^27972606991 is an apocalyptic number.

27972606991 is a deficient number, since it is larger than the sum of its proper divisors (5041574897).

27972606991 is a wasteful number, since it uses less digits than its factorization.

27972606991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55662.

The product of its (nonzero) digits is 5143824, while the sum is 58.

The spelling of 27972606991 in words is "twenty-seven billion, nine hundred seventy-two million, six hundred six thousand, nine hundred ninety-one".