545006781 has 48 divisors (see below), whose sum is σ = 920499840. Its totient is φ = 307359360.

The previous prime is 545006771. The next prime is 545006821. The reversal of 545006781 is 187600545.

It is not a de Polignac number, because 545006781 - 2¹⁹ = 544482493 is a prime.

It is a super-2 number, since 2×545006781² = 594064782671963922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (545006711) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 81015 + ... + 87483.

It is an arithmetic number, because the mean of its divisors is an integer number (19177080).

Almost surely, 2^545006781 is an apocalyptic number.

It is an amenable number.

545006781 is a deficient number, since it is larger than the sum of its proper divisors (375493059).

545006781 is a wasteful number, since it uses less digits than its factorization.

545006781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6546 (or 6543 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The square root of 545006781 is about 23345.3802924690. The cubic root of 545006781 is about 816.8343047414.

The spelling of 545006781 in words is "five hundred forty-five million, six thousand, seven hundred eighty-one".