543639978 has 64 divisors (see below), whose sum is σ = 1383371520. Its totient is φ = 155022336.

The previous prime is 543639973. The next prime is 543640037. The reversal of 543639978 is 879936345.

543639978 is a `hidden beast` number, since 543 + 6 + 3 + 9 + 97 + 8 = 666.

It is a super-3 number, since 3×543639978³ (a number of 27 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (543639973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 253326 + ... + 255462.

It is an arithmetic number, because the mean of its divisors is an integer number (21615180).

Almost surely, 2^543639978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 543639978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (691685760).

543639978 is an abundant number, since it is smaller than the sum of its proper divisors (839731542).

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

543639978 is a wasteful number, since it uses less digits than its factorization.

543639978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2828 (or 2822 counting only the distinct ones).

The product of its digits is 4898880, while the sum is 54.

The square root of 543639978 is about 23316.0883940682. The cubic root of 543639978 is about 816.1508966183.

The spelling of 543639978 in words is "five hundred forty-three million, six hundred thirty-nine thousand, nine hundred seventy-eight".