549989977320 has 768 divisors, whose sum is σ = 2156964526080. Its totient is φ = 123451776000.

The previous prime is 549989977267. The next prime is 549989977321. The reversal of 549989977320 is 23779989945.

549989977320 is a `hidden beast` number, since 54 + 99 + 89 + 97 + 7 + 320 = 666.

It is a super-2 number, since 2×549989977320² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is not an unprimeable number, because it can be changed into a prime (549989977321) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 1120142275 + ... + 1120142765.

It is an arithmetic number, because the mean of its divisors is an integer number (2808547560).

Almost surely, 2^549989977320 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 549989977320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1078482263040).

549989977320 is an abundant number, since it is smaller than the sum of its proper divisors (1606974548760).

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

549989977320 is a wasteful number, since it uses less digits than its factorization.

549989977320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 788 (or 772 counting only the distinct ones).

The product of its (nonzero) digits is 308629440, while the sum is 72.

The spelling of 549989977320 in words is "five hundred forty-nine billion, nine hundred eighty-nine million, nine hundred seventy-seven thousand, three hundred twenty".