7128780 has 96 divisors (see below), whose sum is σ = 21954240. Its totient is φ = 1720320.

The previous prime is 7128767. The next prime is 7128799. The reversal of 7128780 is 878217.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29460 + ... + 29700.

It is an arithmetic number, because the mean of its divisors is an integer number (228690).

Almost surely, 2^7128780 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 7128780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10977120).

7128780 is an abundant number, since it is smaller than the sum of its proper divisors (14825460).

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

7128780 is a wasteful number, since it uses less digits than its factorization.

7128780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299 (or 297 counting only the distinct ones).

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

The square root of 7128780 is about 2669.9775279953. The cubic root of 7128780 is about 192.4590794000.

The spelling of 7128780 in words is "seven million, one hundred twenty-eight thousand, seven hundred eighty".