7899893820 has 384 divisors, whose sum is σ = 30400634880. Its totient is φ = 1658465280.

The previous prime is 7899893801. The next prime is 7899893831. The reversal of 7899893820 is 283989987.

It is a Harshad number since it is a multiple of its sum of digits (63).

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 127 ways as a sum of consecutive naturals, for example, 18329005 + ... + 18329435.

It is an arithmetic number, because the mean of its divisors is an integer number (79168320).

Almost surely, 2^7899893820 is an apocalyptic number.

7899893820 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7899893820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15200317440).

7899893820 is an abundant number, since it is smaller than the sum of its proper divisors (22500741060).

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

7899893820 is a wasteful number, since it uses less digits than its factorization.

7899893820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 842 (or 834 counting only the distinct ones).

The product of its (nonzero) digits is 15676416, while the sum is 63.

The square root of 7899893820 is about 88881.3468619822. The cubic root of 7899893820 is about 1991.6227784038.

The spelling of 7899893820 in words is "seven billion, eight hundred ninety-nine million, eight hundred ninety-three thousand, eight hundred twenty".