27651397 has 4 divisors (see below), whose sum is σ = 27702496. Its totient is φ = 27600300.

The previous prime is 27651347. The next prime is 27651431. The reversal of 27651397 is 79315672.

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 not a de Polignac number, because 27651397 - 2⁷ = 27651269 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 (27651347) 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, 24729 + ... + 25822.

It is an arithmetic number, because the mean of its divisors is an integer number (6925624).

Almost surely, 2^27651397 is an apocalyptic number.

It is an amenable number.

27651397 is a deficient number, since it is larger than the sum of its proper divisors (51099).

27651397 is an equidigital number, since it uses as much as digits as its factorization.

27651397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51098.

The product of its digits is 79380, while the sum is 40.

The square root of 27651397 is about 5258.4595653100. The cubic root of 27651397 is about 302.3934355874.

The spelling of 27651397 in words is "twenty-seven million, six hundred fifty-one thousand, three hundred ninety-seven".