545639220 has 96 divisors (see below), whose sum is σ = 1940064000. Its totient is φ = 124716672.

The previous prime is 545639209. The next prime is 545639221. The reversal of 545639220 is 22936545.

545639220 is a `hidden beast` number, since 5 + 4 + 563 + 92 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (545639221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 68395 + ... + 75954.

It is an arithmetic number, because the mean of its divisors is an integer number (20209000).

Almost surely, 2^545639220 is an apocalyptic number.

It is an amenable number.

545639220 is an abundant number, since it is smaller than the sum of its proper divisors (1394424780).

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

545639220 is a wasteful number, since it uses less digits than its factorization.

545639220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144374 (or 144366 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 545639220 is about 23358.9216360687. The cubic root of 545639220 is about 817.1501406743.

The spelling of 545639220 in words is "five hundred forty-five million, six hundred thirty-nine thousand, two hundred twenty".