540073781 has 8 divisors (see below), whose sum is σ = 581811384. Its totient is φ = 498363840.

The previous prime is 540073769. The next prime is 540073789. The reversal of 540073781 is 187370045.

It can be written as a sum of positive squares in 4 ways, for example, as 255025 + 539818756 = 505^2 + 23234^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 540073781 - 2²⁶ = 472964917 is a prime.

It is a super-2 number, since 2×540073781² = 583359377847271922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (540073789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52775 + ... + 62171.

It is an arithmetic number, because the mean of its divisors is an integer number (72726423).

Almost surely, 2^540073781 is an apocalyptic number.

It is an amenable number.

540073781 is a deficient number, since it is larger than the sum of its proper divisors (41737603).

540073781 is a wasteful number, since it uses less digits than its factorization.

540073781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13831.

The product of its (nonzero) digits is 23520, while the sum is 35.

The square root of 540073781 is about 23239.4875373791. The cubic root of 540073781 is about 814.3623707795.

The spelling of 540073781 in words is "five hundred forty million, seventy-three thousand, seven hundred eighty-one".