7864040 has 48 divisors (see below), whose sum is σ = 18281700. Its totient is φ = 3044096.

The previous prime is 7864037. The next prime is 7864057. The reversal of 7864040 is 404687.

It can be written as a sum of positive squares in 2 ways, for example, as 7431076 + 432964 = 2726^2 + 658^2 .

It is a junction number, because it is equal to n+sod(n) for n = 7863994 and 7864012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 88316 + ... + 88404.

Almost surely, 2^7864040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7864040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9140850).

7864040 is an abundant number, since it is smaller than the sum of its proper divisors (10417660).

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

7864040 is a wasteful number, since it uses less digits than its factorization.

7864040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194 (or 143 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 7864040 is about 2804.2895713531. The cubic root of 7864040 is about 198.8605202589.

The spelling of 7864040 in words is "seven million, eight hundred sixty-four thousand, forty".