7828863440 has 20 divisors (see below), whose sum is σ = 18202107684. Its totient is φ = 3131545344.

The previous prime is 7828863439. The next prime is 7828863463. The reversal of 7828863440 is 443688287.

It can be written as a sum of positive squares in 2 ways, for example, as 5593843264 + 2235020176 = 74792^2 + 47276^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×7828863440² (a number of 21 digits) contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 48930317 + ... + 48930476.

Almost surely, 2^7828863440 is an apocalyptic number.

It is an amenable number.

7828863440 is an abundant number, since it is smaller than the sum of its proper divisors (10373244244).

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

7828863440 is a wasteful number, since it uses less digits than its factorization.

7828863440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97860806 (or 97860800 counting only the distinct ones).

The product of its (nonzero) digits is 2064384, while the sum is 50.

The square root of 7828863440 is about 88480.8648239833. The cubic root of 7828863440 is about 1985.6357004349.

The spelling of 7828863440 in words is "seven billion, eight hundred twenty-eight million, eight hundred sixty-three thousand, four hundred forty".