27972001 has 4 divisors (see below), whose sum is σ = 28052500. Its totient is φ = 27891504.

The previous prime is 27971989. The next prime is 27972023. The reversal of 27972001 is 10027972.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 24512401 + 3459600 = 4951^2 + 1860^2 .

It is a cyclic number.

It is not a de Polignac number, because 27972001 - 2⁷ = 27971873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27972041) 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, 39726 + ... + 40423.

It is an arithmetic number, because the mean of its divisors is an integer number (7013125).

Almost surely, 2^27972001 is an apocalyptic number.

It is an amenable number.

27972001 is a deficient number, since it is larger than the sum of its proper divisors (80499).

27972001 is an equidigital number, since it uses as much as digits as its factorization.

27972001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80498.

The product of its (nonzero) digits is 1764, while the sum is 28.

The square root of 27972001 is about 5288.8563035878. The cubic root of 27972001 is about 303.5576474139.

Adding to 27972001 its reverse (10027972), we get a palindrome (37999973).

The spelling of 27972001 in words is "twenty-seven million, nine hundred seventy-two thousand, one".