36072781 has 4 divisors (see below), whose sum is σ = 37316700. Its totient is φ = 34828864.

The previous prime is 36072779. The next prime is 36072821. The reversal of 36072781 is 18727063.

36072781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11964681 + 24108100 = 3459^2 + 4910^2 .

It is a cyclic number.

It is not a de Polignac number, because 36072781 - 2¹ = 36072779 is a prime.

It is a super-2 number, since 2×36072781² = 2602491058147922, 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 (36072721) 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 3 ways as a sum of consecutive naturals, for example, 621916 + ... + 621973.

It is an arithmetic number, because the mean of its divisors is an integer number (9329175).

Almost surely, 2^36072781 is an apocalyptic number.

It is an amenable number.

36072781 is a deficient number, since it is larger than the sum of its proper divisors (1243919).

36072781 is a wasteful number, since it uses less digits than its factorization.

36072781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1243918.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 36072781 is about 6006.0620209918. The cubic root of 36072781 is about 330.4150913702.

The spelling of 36072781 in words is "thirty-six million, seventy-two thousand, seven hundred eighty-one".