40647645 has 24 divisors (see below), whose sum is σ = 72363096. Its totient is φ = 21091968.

The previous prime is 40647617. The next prime is 40647667. The reversal of 40647645 is 54674604.

40647645 is a `hidden beast` number, since 4 + 0 + 6 + 4 + 7 + 645 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 5861241 + 34786404 = 2421^2 + 5898^2 .

It is not a de Polignac number, because 40647645 - 2⁵ = 40647613 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10542 + ... + 13871.

It is an arithmetic number, because the mean of its divisors is an integer number (3015129).

Almost surely, 2^40647645 is an apocalyptic number.

40647645 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

40647645 is a deficient number, since it is larger than the sum of its proper divisors (31715451).

40647645 is a wasteful number, since it uses less digits than its factorization.

40647645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24461 (or 24458 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 36.

The square root of 40647645 is about 6375.5505644611. The cubic root of 40647645 is about 343.8310786159.

The spelling of 40647645 in words is "forty million, six hundred forty-seven thousand, six hundred forty-five".