7640040 has 32 divisors (see below), whose sum is σ = 22920480. Its totient is φ = 2037312.

The previous prime is 7640029. The next prime is 7640047. The reversal of 7640040 is 400467.

7640040 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×7640040² = 116740422403200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7639989 and 7640016.

It is not an unprimeable number, because it can be changed into a prime (7640047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31714 + ... + 31953.

It is an arithmetic number, because the mean of its divisors is an integer number (716265).

Almost surely, 2^7640040 is an apocalyptic number.

It is an amenable number.

7640040 is an abundant number, since it is smaller than the sum of its proper divisors (15280440).

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

7640040 is a wasteful number, since it uses less digits than its factorization.

7640040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63681 (or 63677 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 7640040 is about 2764.0622279536. The cubic root of 7640040 is about 196.9541838192.

The spelling of 7640040 in words is "seven million, six hundred forty thousand, forty".