7891280 has 20 divisors (see below), whose sum is σ = 18347412. Its totient is φ = 3156480.

The previous prime is 7891271. The next prime is 7891283. The reversal of 7891280 is 821987.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3794704 + 4096576 = 1948^2 + 2024^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 7891280.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7891283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49241 + ... + 49400.

Almost surely, 2^7891280 is an apocalyptic number.

It is an amenable number.

7891280 is an abundant number, since it is smaller than the sum of its proper divisors (10456132).

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

7891280 is a wasteful number, since it uses less digits than its factorization.

7891280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98654 (or 98648 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 7891280 is about 2809.1422178309. The cubic root of 7891280 is about 199.0898645499.

The spelling of 7891280 in words is "seven million, eight hundred ninety-one thousand, two hundred eighty".