7905640 has 16 divisors (see below), whose sum is σ = 17787780. Its totient is φ = 3162240.

The previous prime is 7905631. The next prime is 7905659. The reversal of 7905640 is 465097.

It can be written as a sum of positive squares in 2 ways, for example, as 7717284 + 188356 = 2778^2 + 434^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98781 + ... + 98860.

Almost surely, 2^7905640 is an apocalyptic number.

It is an amenable number.

7905640 is an abundant number, since it is smaller than the sum of its proper divisors (9882140).

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

7905640 is a wasteful number, since it uses less digits than its factorization.

7905640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197652 (or 197648 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 7905640 is about 2811.6969964774. The cubic root of 7905640 is about 199.2105546468.

The spelling of 7905640 in words is "seven million, nine hundred five thousand, six hundred forty".