27777979904 has 80 divisors (see below), whose sum is σ = 57987159120. Its totient is φ = 13276569600.

The previous prime is 27777979883. The next prime is 27777979909. The reversal of 27777979904 is 40997977772.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27777979909) 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, 1490387 + ... + 1508909.

It is an arithmetic number, because the mean of its divisors is an integer number (724839489).

Almost surely, 2^27777979904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27777979904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28993579560).

27777979904 is an abundant number, since it is smaller than the sum of its proper divisors (30209179216).

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

27777979904 is a wasteful number, since it uses less digits than its factorization.

27777979904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18671 (or 18655 counting only the distinct ones).

The product of its (nonzero) digits is 98018424, while the sum is 68.

The spelling of 27777979904 in words is "twenty-seven billion, seven hundred seventy-seven million, nine hundred seventy-nine thousand, nine hundred four".