545809780 has 48 divisors (see below), whose sum is σ = 1199245824. Its totient is φ = 208271360.

The previous prime is 545809739. The next prime is 545809799. The reversal of 545809780 is 87908545.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a self number, because there is not a number n which added to its sum of digits gives 545809780.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 196884 + ... + 199636.

It is an arithmetic number, because the mean of its divisors is an integer number (24984288).

Almost surely, 2^545809780 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 545809780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (599622912).

545809780 is an abundant number, since it is smaller than the sum of its proper divisors (653436044).

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

545809780 is a wasteful number, since it uses less digits than its factorization.

545809780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3216 (or 3214 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 46.

The square root of 545809780 is about 23362.5722042758. The cubic root of 545809780 is about 817.2352754442.

The spelling of 545809780 in words is "five hundred forty-five million, eight hundred nine thousand, seven hundred eighty".