27398858436 has 18 divisors (see below), whose sum is σ = 69258225582. Its totient is φ = 9132952800.

The previous prime is 27398858423. The next prime is 27398858441. The reversal of 27398858436 is 63485889372.

27398858436 is a `hidden beast` number, since 2 + 73 + 9 + 88 + 58 + 436 = 666.

It can be written as a sum of positive squares in only one way, i.e., 27145857600 + 253000836 = 164760^2 + 15906^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 380539665 + ... + 380539736.

It is an arithmetic number, because the mean of its divisors is an integer number (3847679199).

Almost surely, 2^27398858436 is an apocalyptic number.

It is an amenable number.

27398858436 is an abundant number, since it is smaller than the sum of its proper divisors (41859367146).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27398858436 is a wasteful number, since it uses less digits than its factorization.

27398858436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 761079411 (or 761079406 counting only the distinct ones).

The product of its digits is 69672960, while the sum is 63.

The spelling of 27398858436 in words is "twenty-seven billion, three hundred ninety-eight million, eight hundred fifty-eight thousand, four hundred thirty-six".