40648581 has 64 divisors (see below), whose sum is σ = 69120000. Its totient is φ = 23452416.

The previous prime is 40648537. The next prime is 40648583. The reversal of 40648581 is 18584604.

40648581 is a `hidden beast` number, since 4 + 0 + 648 + 5 + 8 + 1 = 666.

It is not a de Polignac number, because 40648581 - 2⁷ = 40648453 is a prime.

It is a super-2 number, since 2×40648581² = 3304614274627122, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40648583) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 514500 + ... + 514578.

It is an arithmetic number, because the mean of its divisors is an integer number (1080000).

Almost surely, 2^40648581 is an apocalyptic number.

It is an amenable number.

40648581 is a deficient number, since it is larger than the sum of its proper divisors (28471419).

40648581 is a wasteful number, since it uses less digits than its factorization.

40648581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183 (or 177 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 40648581 is about 6375.6239694637. The cubic root of 40648581 is about 343.8337177473.

The spelling of 40648581 in words is "forty million, six hundred forty-eight thousand, five hundred eighty-one".