27878763890 has 8 divisors (see below), whose sum is σ = 50181775020. Its totient is φ = 11151505552.

The previous prime is 27878763881. The next prime is 27878763893. The reversal of 27878763890 is 9836787872.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 25439293009 + 2439470881 = 159497^2 + 49391^2 .

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

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (27878763893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1393938185 + ... + 1393938204.

Almost surely, 2^27878763890 is an apocalyptic number.

27878763890 is a deficient number, since it is larger than the sum of its proper divisors (22303011130).

27878763890 is a wasteful number, since it uses less digits than its factorization.

27878763890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2787876396.

The product of its (nonzero) digits is 56899584, while the sum is 65.

The spelling of 27878763890 in words is "twenty-seven billion, eight hundred seventy-eight million, seven hundred sixty-three thousand, eight hundred ninety".