799999920 has 120 divisors (see below), whose sum is σ = 2698488000. Its totient is φ = 212395008.

The previous prime is 799999897. The next prime is 799999927. The reversal of 799999920 is 29999997.

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (799999927) 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 23 ways as a sum of consecutive naturals, for example, 169756 + ... + 174404.

It is an arithmetic number, because the mean of its divisors is an integer number (22487400).

Almost surely, 2^799999920 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 799999920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1349244000).

799999920 is an abundant number, since it is smaller than the sum of its proper divisors (1898488080).

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

799999920 is a wasteful number, since it uses less digits than its factorization.

799999920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4907 (or 4898 counting only the distinct ones).

The product of its (nonzero) digits is 7440174, while the sum is 63.

The square root of 799999920 is about 28284.2698332483. The cubic root of 799999920 is about 928.3177357786.

It can be divided in two parts, 79 and 9999920, that added together give a palindrome (9999999).

The spelling of 799999920 in words is "seven hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred twenty".