27819896644849 has 9 divisors (see below), whose sum is σ = 29361270924153. Its totient is φ = 26355596618052.

The previous prime is 27819896644843. The next prime is 27819896644913. The reversal of 27819896644849 is 94844669891872.

The square root of 27819896644849 is 5274457.

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

It is not a de Polignac number, because 27819896644849 - 2⁴³ = 19023803622641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27819896644843) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 100075882 + ... + 100353484.

It is an arithmetic number, because the mean of its divisors is an integer number (3262363436017).

Almost surely, 2^{27819896644849} is an apocalyptic number.

27819896644849 is the 5274457-th square number.

27819896644849 is the 2637229-th centered octagonal number.

It is an amenable number.

27819896644849 is a deficient number, since it is larger than the sum of its proper divisors (1541374279304).

27819896644849 is an frugal number, since it uses more digits than its factorization.

27819896644849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555244 (or 277622 counting only the distinct ones).

The product of its digits is 12039487488, while the sum is 85.

The spelling of 27819896644849 in words is "twenty-seven trillion, eight hundred nineteen billion, eight hundred ninety-six million, six hundred forty-four thousand, eight hundred forty-nine".