7809491828 has 12 divisors (see below), whose sum is σ = 13669374180. Its totient is φ = 3903956352.

The previous prime is 7809491803. The next prime is 7809491831. The reversal of 7809491828 is 8281949087.

It can be written as a sum of positive squares in 2 ways, for example, as 3205597924 + 4603893904 = 56618^2 + 67852^2 .

It is a super-2 number, since 2×7809491828² (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 (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 174851 + ... + 214922.

It is an arithmetic number, because the mean of its divisors is an integer number (1139114515).

Almost surely, 2^7809491828 is an apocalyptic number.

It is an amenable number.

7809491828 is a deficient number, since it is larger than the sum of its proper divisors (5859882352).

7809491828 is a wasteful number, since it uses less digits than its factorization.

7809491828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394786 (or 394784 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 56.

The square root of 7809491828 is about 88371.3292193797. The cubic root of 7809491828 is about 1983.9966062447.

The spelling of 7809491828 in words is "seven billion, eight hundred nine million, four hundred ninety-one thousand, eight hundred twenty-eight".