27978151 has 4 divisors (see below), whose sum is σ = 28880704. Its totient is φ = 27075600.

The previous prime is 27978149. The next prime is 27978157. The reversal of 27978151 is 15187972.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 27978151 - 2¹ = 27978149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27978157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 451230 + ... + 451291.

It is an arithmetic number, because the mean of its divisors is an integer number (7220176).

Almost surely, 2^27978151 is an apocalyptic number.

27978151 is a deficient number, since it is larger than the sum of its proper divisors (902553).

27978151 is an equidigital number, since it uses as much as digits as its factorization.

27978151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 902552.

The product of its digits is 35280, while the sum is 40.

The square root of 27978151 is about 5289.4376827788. The cubic root of 27978151 is about 303.5798927862.

The spelling of 27978151 in words is "twenty-seven million, nine hundred seventy-eight thousand, one hundred fifty-one".