45636781 has 4 divisors (see below), whose sum is σ = 45651232. Its totient is φ = 45622332.

The previous prime is 45636739. The next prime is 45636827. The reversal of 45636781 is 18763654.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 45636781 - 2¹¹ = 45634733 is a prime.

It is a super-2 number, since 2×45636781² = 4165431560083922, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is the 6756-th Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45636181) by changing a digit.

It is a nontrivial repunit in base 6755.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 231 + ... + 9556.

It is an arithmetic number, because the mean of its divisors is an integer number (11412808).

Almost surely, 2^45636781 is an apocalyptic number.

It is an amenable number.

45636781 is a deficient number, since it is larger than the sum of its proper divisors (14451).

45636781 is an equidigital number, since it uses as much as digits as its factorization.

45636781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14450.

The product of its digits is 120960, while the sum is 40.

The square root of 45636781 is about 6755.5000555103. The cubic root of 45636781 is about 357.3592279963.

The spelling of 45636781 in words is "forty-five million, six hundred thirty-six thousand, seven hundred eighty-one".