36128781 has 16 divisors (see below), whose sum is σ = 57641920. Its totient is φ = 22232880.

The previous prime is 36128779. The next prime is 36128783. The reversal of 36128781 is 18782163.

It is an interprime number because it is at equal distance from previous prime (36128779) and next prime (36128783).

It is not a de Polignac number, because 36128781 - 2¹ = 36128779 is a prime.

It is a super-2 number, since 2×36128781² = 2610577633091922, 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 (36128783) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51115 + ... + 51816.

It is an arithmetic number, because the mean of its divisors is an integer number (3602620).

Almost surely, 2^36128781 is an apocalyptic number.

It is an amenable number.

36128781 is a deficient number, since it is larger than the sum of its proper divisors (21513139).

36128781 is a wasteful number, since it uses less digits than its factorization.

36128781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102953 (or 102947 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 36128781 is about 6010.7221695899. The cubic root of 36128781 is about 330.5859836416.

The spelling of 36128781 in words is "thirty-six million, one hundred twenty-eight thousand, seven hundred eighty-one".