549371778 has 16 divisors (see below), whose sum is σ = 1102213440. Its totient is φ = 182545616.

The previous prime is 549371773. The next prime is 549371789. The reversal of 549371778 is 877173945.

It is a self number, because there is not a number n which added to its sum of digits gives 549371778.

It is not an unprimeable number, because it can be changed into a prime (549371773) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142518 + ... + 146321.

It is an arithmetic number, because the mean of its divisors is an integer number (68888340).

Almost surely, 2^549371778 is an apocalyptic number.

549371778 is an abundant number, since it is smaller than the sum of its proper divisors (552841662).

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

549371778 is a wasteful number, since it uses less digits than its factorization.

549371778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289161.

The product of its digits is 1481760, while the sum is 51.

The square root of 549371778 is about 23438.6812342333. The cubic root of 549371778 is about 819.0092028765.

The spelling of 549371778 in words is "five hundred forty-nine million, three hundred seventy-one thousand, seven hundred seventy-eight".