799890640 has 20 divisors (see below), whose sum is σ = 1859745924. Its totient is φ = 319956224.

The previous prime is 799890571. The next prime is 799890643. The reversal of 799890640 is 46098997.

It can be written as a sum of positive squares in 2 ways, for example, as 445547664 + 354342976 = 21108^2 + 18824^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (799890643) by changing a digit.

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, 4999237 + ... + 4999396.

Almost surely, 2^799890640 is an apocalyptic number.

It is an amenable number.

799890640 is an abundant number, since it is smaller than the sum of its proper divisors (1059855284).

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

799890640 is a wasteful number, since it uses less digits than its factorization.

799890640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9998646 (or 9998640 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 52.

The square root of 799890640 is about 28282.3379514495. The cubic root of 799890640 is about 928.2754644487.

The spelling of 799890640 in words is "seven hundred ninety-nine million, eight hundred ninety thousand, six hundred forty".