8040640 has 28 divisors (see below), whose sum is σ = 19147536. Its totient is φ = 3216128.

The previous prime is 8040631. The next prime is 8040647. The reversal of 8040640 is 460408.

It is not an unprimeable number, because it can be changed into a prime (8040647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12244 + ... + 12883.

Almost surely, 2^8040640 is an apocalyptic number.

8040640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8040640 is an abundant number, since it is smaller than the sum of its proper divisors (11106896).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8040640 is a wasteful number, since it uses less digits than its factorization.

8040640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25144 (or 25134 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 8040640 is about 2835.6022288043. The cubic root of 8040640 is about 200.3380948041.

Adding to 8040640 its product of nonzero digits (768), we get a palindrome (8041408).

The spelling of 8040640 in words is "eight million, forty thousand, six hundred forty".