27972915 has 8 divisors (see below), whose sum is σ = 44756688. Its totient is φ = 14918880.

The previous prime is 27972913. The next prime is 27972949. The reversal of 27972915 is 51927972.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 27972915 - 2¹ = 27972913 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (27972911) 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, 932416 + ... + 932445.

It is an arithmetic number, because the mean of its divisors is an integer number (5594586).

Almost surely, 2^27972915 is an apocalyptic number.

27972915 is a deficient number, since it is larger than the sum of its proper divisors (16783773).

27972915 is a wasteful number, since it uses less digits than its factorization.

27972915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1864869.

The product of its digits is 79380, while the sum is 42.

The square root of 27972915 is about 5288.9427109773. The cubic root of 27972915 is about 303.5609536804.

The spelling of 27972915 in words is "twenty-seven million, nine hundred seventy-two thousand, nine hundred fifteen".