27621001 has 4 divisors (see below), whose sum is σ = 27760000. Its totient is φ = 27482004.

The previous prime is 27620977. The next prime is 27621019. The reversal of 27621001 is 10012672.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27621001 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27621001.

It is not an unprimeable number, because it can be changed into a prime (27621401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69201 + ... + 69598.

It is an arithmetic number, because the mean of its divisors is an integer number (6940000).

Almost surely, 2^27621001 is an apocalyptic number.

It is an amenable number.

27621001 is a deficient number, since it is larger than the sum of its proper divisors (138999).

27621001 is a wasteful number, since it uses less digits than its factorization.

27621001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138998.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 27621001 is about 5255.5685705735. The cubic root of 27621001 is about 302.2825922319.

Adding to 27621001 its reverse (10012672), we get a palindrome (37633673).

The spelling of 27621001 in words is "twenty-seven million, six hundred twenty-one thousand, one".