27698764921 has 8 divisors (see below), whose sum is σ = 30603239424. Its totient is φ = 24935972160.

The previous prime is 27698764913. The next prime is 27698764943. The reversal of 27698764921 is 12946789672.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 27698764921 - 2³ = 27698764913 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27698764921.

It is not an unprimeable number, because it can be changed into a prime (27698764901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35420025 + ... + 35420806.

It is an arithmetic number, because the mean of its divisors is an integer number (3825404928).

Almost surely, 2^27698764921 is an apocalyptic number.

It is an amenable number.

27698764921 is a deficient number, since it is larger than the sum of its proper divisors (2904474503).

27698764921 is a wasteful number, since it uses less digits than its factorization.

27698764921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70840871.

The product of its digits is 18289152, while the sum is 61.

The spelling of 27698764921 in words is "twenty-seven billion, six hundred ninety-eight million, seven hundred sixty-four thousand, nine hundred twenty-one".