549779978 has 16 divisors (see below), whose sum is σ = 928661760. Its totient is φ = 241838400.

The previous prime is 549779959. The next prime is 549780001. The reversal of 549779978 is 879977945.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 402383 + ... + 403746.

It is an arithmetic number, because the mean of its divisors is an integer number (58041360).

Almost surely, 2^549779978 is an apocalyptic number.

549779978 is a deficient number, since it is larger than the sum of its proper divisors (378881782).

549779978 is a wasteful number, since it uses less digits than its factorization.

549779978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 806173.

The product of its digits is 40007520, while the sum is 65.

The square root of 549779978 is about 23447.3874450865. The cubic root of 549779978 is about 819.2120022684.

The spelling of 549779978 in words is "five hundred forty-nine million, seven hundred seventy-nine thousand, nine hundred seventy-eight".