800721120 has 96 divisors (see below), whose sum is σ = 2527604352. Its totient is φ = 213074432.

The previous prime is 800721113. The next prime is 800721127. The reversal of 800721120 is 21127008.

It is an interprime number because it is at equal distance from previous prime (800721113) and next prime (800721127).

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (800721127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 268759 + ... + 271721.

It is an arithmetic number, because the mean of its divisors is an integer number (26329212).

Almost surely, 2^800721120 is an apocalyptic number.

800721120 is a gapful number since it is divisible by the number (80) 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 800721120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1263802176).

800721120 is an abundant number, since it is smaller than the sum of its proper divisors (1726883232).

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

800721120 is a wasteful number, since it uses less digits than its factorization.

800721120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3544 (or 3536 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 800721120 is about 28297.0160971082. The cubic root of 800721120 is about 928.5966115007.

Adding to 800721120 its reverse (21127008), we get a palindrome (821848128).

The spelling of 800721120 in words is "eight hundred million, seven hundred twenty-one thousand, one hundred twenty".