549999980 has 24 divisors (see below), whose sum is σ = 1222941888. Its totient is φ = 207058688.

The previous prime is 549999959. The next prime is 550000001. The reversal of 549999980 is 89999945.

It is an interprime number because it is at equal distance from previous prime (549999959) and next prime (550000001).

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, 808484 + ... + 809163.

It is an arithmetic number, because the mean of its divisors is an integer number (50955912).

Almost surely, 2^549999980 is an apocalyptic number.

It is an amenable number.

549999980 is an abundant number, since it is smaller than the sum of its proper divisors (672941908).

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

549999980 is a wasteful number, since it uses less digits than its factorization.

549999980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1617673 (or 1617671 counting only the distinct ones).

The product of its (nonzero) digits is 9447840, while the sum is 62.

The square root of 549999980 is about 23452.0783727157. The cubic root of 549999980 is about 819.3212606695.

The spelling of 549999980 in words is "five hundred forty-nine million, nine hundred ninety-nine thousand, nine hundred eighty".