27768915 has 12 divisors (see below), whose sum is σ = 48132864. Its totient is φ = 14810064.

The previous prime is 27768911. The next prime is 27768919. The reversal of 27768915 is 51986772.

It is an interprime number because it is at equal distance from previous prime (27768911) and next prime (27768919).

It is not a de Polignac number, because 27768915 - 2² = 27768911 is a prime.

It is a super-2 number, since 2×27768915² = 1542225280554450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 617087 = 27768915 / (2 + 7 + 7 + 6 + 8 + 9 + 1 + 5).

It is not an unprimeable number, because it can be changed into a prime (27768911) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 308499 + ... + 308588.

It is an arithmetic number, because the mean of its divisors is an integer number (4011072).

Almost surely, 2^27768915 is an apocalyptic number.

27768915 is a deficient number, since it is larger than the sum of its proper divisors (20363949).

27768915 is a wasteful number, since it uses less digits than its factorization.

27768915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617098 (or 617095 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 27768915 is about 5269.6219029452. The cubic root of 27768915 is about 302.8212192405.

The spelling of 27768915 in words is "twenty-seven million, seven hundred sixty-eight thousand, nine hundred fifteen".