27764381 has 4 divisors (see below), whose sum is σ = 28971552. Its totient is φ = 26557212.

The previous prime is 27764353. The next prime is 27764389. The reversal of 27764381 is 18346772.

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-27764381 is a prime.

It is a super-2 number, since 2×27764381² = 1541721704626322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27764389) 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, 603551 + ... + 603596.

It is an arithmetic number, because the mean of its divisors is an integer number (7242888).

Almost surely, 2^27764381 is an apocalyptic number.

It is an amenable number.

27764381 is a deficient number, since it is larger than the sum of its proper divisors (1207171).

27764381 is a wasteful number, since it uses less digits than its factorization.

27764381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1207170.

The product of its digits is 56448, while the sum is 38.

The square root of 27764381 is about 5269.1916837405. The cubic root of 27764381 is about 302.8047371880.

The spelling of 27764381 in words is "twenty-seven million, seven hundred sixty-four thousand, three hundred eighty-one".