7881720 has 128 divisors (see below), whose sum is σ = 29514240. Its totient is φ = 1635840.

The previous prime is 7881701. The next prime is 7881721. The reversal of 7881720 is 271887.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7881721) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8814 + ... + 9666.

It is an arithmetic number, because the mean of its divisors is an integer number (230580).

Almost surely, 2^7881720 is an apocalyptic number.

7881720 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 7881720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14757120).

7881720 is an abundant number, since it is smaller than the sum of its proper divisors (21632520).

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

7881720 is a wasteful number, since it uses less digits than its factorization.

7881720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 885 (or 881 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 33.

The square root of 7881720 is about 2807.4401151227. The cubic root of 7881720 is about 199.0094353413.

The spelling of 7881720 in words is "seven million, eight hundred eighty-one thousand, seven hundred twenty".