55091378 has 4 divisors (see below), whose sum is σ = 82637070. Its totient is φ = 27545688.

The previous prime is 55091369. The next prime is 55091381. The reversal of 55091378 is 87319055.

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

It can be written as a sum of positive squares in only one way, i.e., 54715609 + 375769 = 7397^2 + 613^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13772843 + ... + 13772846.

Almost surely, 2^55091378 is an apocalyptic number.

55091378 is a deficient number, since it is larger than the sum of its proper divisors (27545692).

55091378 is a wasteful number, since it uses less digits than its factorization.

55091378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27545691.

The product of its (nonzero) digits is 37800, while the sum is 38.

The square root of 55091378 is about 7422.3566338462. The cubic root of 55091378 is about 380.5057393588.

The spelling of 55091378 in words is "fifty-five million, ninety-one thousand, three hundred seventy-eight".