27748404 has 18 divisors (see below), whose sum is σ = 70141890. Its totient is φ = 9249456.

The previous prime is 27748397. The next prime is 27748421. The reversal of 27748404 is 40484772.

It can be written as a sum of positive squares in only one way, i.e., 22467600 + 5280804 = 4740^2 + 2298^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 770789 = 27748404 / (2 + 7 + 7 + 4 + 8 + 4 + 0 + 4).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 385359 + ... + 385430.

Almost surely, 2^27748404 is an apocalyptic number.

It is an amenable number.

27748404 is an abundant number, since it is smaller than the sum of its proper divisors (42393486).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27748404 is a wasteful number, since it uses less digits than its factorization.

27748404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 770799 (or 770794 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 36.

The square root of 27748404 is about 5267.6753886321. The cubic root of 27748404 is about 302.7466430953.

The spelling of 27748404 in words is "twenty-seven million, seven hundred forty-eight thousand, four hundred four".