27389908491 has 16 divisors (see below), whose sum is σ = 39906185088. Its totient is φ = 16572312000.

The previous prime is 27389908421. The next prime is 27389908499. The reversal of 27389908491 is 19480998372.

It is not a de Polignac number, because 27389908491 - 2¹⁴ = 27389892107 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27389908499) 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, 670681 + ... + 710346.

It is an arithmetic number, because the mean of its divisors is an integer number (2494136568).

Almost surely, 2^27389908491 is an apocalyptic number.

27389908491 is a deficient number, since it is larger than the sum of its proper divisors (12516276597).

27389908491 is a wasteful number, since it uses less digits than its factorization.

27389908491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1381642.

The product of its (nonzero) digits is 7838208, while the sum is 60.

The spelling of 27389908491 in words is "twenty-seven billion, three hundred eighty-nine million, nine hundred eight thousand, four hundred ninety-one".