27777640387 has 16 divisors (see below), whose sum is σ = 33741160960. Its totient is φ = 22337275392.

The previous prime is 27777640381. The next prime is 27777640393. The reversal of 27777640387 is 78304677772.

It is an interprime number because it is at equal distance from previous prime (27777640381) and next prime (27777640393).

It is a cyclic number.

It is not a de Polignac number, because 27777640387 - 2⁷ = 27777640259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27777640381) 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, 1000158 + ... + 1027555.

It is an arithmetic number, because the mean of its divisors is an integer number (2108822560).

Almost surely, 2^27777640387 is an apocalyptic number.

27777640387 is a deficient number, since it is larger than the sum of its proper divisors (5963520573).

27777640387 is a wasteful number, since it uses less digits than its factorization.

27777640387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2027842.

The product of its (nonzero) digits is 19361664, while the sum is 58.

The spelling of 27777640387 in words is "twenty-seven billion, seven hundred seventy-seven million, six hundred forty thousand, three hundred eighty-seven".