27646866387 has 96 divisors (see below), whose sum is σ = 48773836800. Its totient is φ = 15055951680.

The previous prime is 27646866371. The next prime is 27646866413. The reversal of 27646866387 is 78366864672.

It is not a de Polignac number, because 27646866387 - 2⁴ = 27646866371 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (27646866367) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 26056837 + ... + 26057897.

It is an arithmetic number, because the mean of its divisors is an integer number (508060800).

Almost surely, 2^27646866387 is an apocalyptic number.

27646866387 is a deficient number, since it is larger than the sum of its proper divisors (21126970413).

27646866387 is a wasteful number, since it uses less digits than its factorization.

27646866387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1478 (or 1461 counting only the distinct ones).

The product of its digits is 97542144, while the sum is 63.

The spelling of 27646866387 in words is "twenty-seven billion, six hundred forty-six million, eight hundred sixty-six thousand, three hundred eighty-seven".