7721080 has 48 divisors (see below), whose sum is σ = 18045720. Its totient is φ = 2971584.

The previous prime is 7721071. The next prime is 7721101. The reversal of 7721080 is 801277.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 115207 + ... + 115273.

Almost surely, 2^7721080 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 7721080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9022860).

7721080 is an abundant number, since it is smaller than the sum of its proper divisors (10324640).

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

7721080 is a wasteful number, since it uses less digits than its factorization.

7721080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188 (or 117 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 25.

The square root of 7721080 is about 2778.6831413459. The cubic root of 7721080 is about 197.6481183389.

The spelling of 7721080 in words is "seven million, seven hundred twenty-one thousand, eighty".