27620645921 has 12 divisors (see below), whose sum is σ = 30395341200. Its totient is φ = 25080352440.

The previous prime is 27620645911. The next prime is 27620645947. The reversal of 27620645921 is 12954602672.

It is not a de Polignac number, because 27620645921 - 2²⁶ = 27553537057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27620645911) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28931 + ... + 236808.

It is an arithmetic number, because the mean of its divisors is an integer number (2532945100).

Almost surely, 2^27620645921 is an apocalyptic number.

It is an amenable number.

27620645921 is a deficient number, since it is larger than the sum of its proper divisors (2774695279).

27620645921 is a wasteful number, since it uses less digits than its factorization.

27620645921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266620 (or 266609 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 44.

The spelling of 27620645921 in words is "twenty-seven billion, six hundred twenty million, six hundred forty-five thousand, nine hundred twenty-one".