27777664398 has 32 divisors (see below), whose sum is σ = 60642496512. Its totient is φ = 8412379200.

The previous prime is 27777664393. The next prime is 27777664399. The reversal of 27777664398 is 89346677772.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27777664391) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16783 + ... + 236298.

It is an arithmetic number, because the mean of its divisors is an integer number (1895078016).

Almost surely, 2^27777664398 is an apocalyptic number.

27777664398 is an abundant number, since it is smaller than the sum of its proper divisors (32864832114).

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

27777664398 is a wasteful number, since it uses less digits than its factorization.

27777664398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254760.

The product of its digits is 149361408, while the sum is 66.

The spelling of 27777664398 in words is "twenty-seven billion, seven hundred seventy-seven million, six hundred sixty-four thousand, three hundred ninety-eight".