27145978 has 16 divisors (see below), whose sum is σ = 41762304. Its totient is φ = 13227760.

The previous prime is 27145973. The next prime is 27145981. The reversal of 27145978 is 87954172.

It is not an unprimeable number, because it can be changed into a prime (27145973) 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, 29343 + ... + 30253.

It is an arithmetic number, because the mean of its divisors is an integer number (2610144).

Almost surely, 2^27145978 is an apocalyptic number.

27145978 is a deficient number, since it is larger than the sum of its proper divisors (14616326).

27145978 is a wasteful number, since it uses less digits than its factorization.

27145978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1277.

The product of its digits is 141120, while the sum is 43.

The square root of 27145978 is about 5210.1802272090. The cubic root of 27145978 is about 300.5396878007.

The spelling of 27145978 in words is "twenty-seven million, one hundred forty-five thousand, nine hundred seventy-eight".