7428881 has 4 divisors (see below), whose sum is σ = 7865892. Its totient is φ = 6991872.

The previous prime is 7428877. The next prime is 7428887. The reversal of 7428881 is 1888247.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2588881 + 4840000 = 1609^2 + 2200^2 .

It is a cyclic number.

It is not a de Polignac number, because 7428881 - 2² = 7428877 is a prime.

It is a super-2 number, since 2×7428881² = 110376545824322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7428887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218480 + ... + 218513.

It is an arithmetic number, because the mean of its divisors is an integer number (1966473).

Almost surely, 2^7428881 is an apocalyptic number.

It is an amenable number.

7428881 is a deficient number, since it is larger than the sum of its proper divisors (437011).

7428881 is a wasteful number, since it uses less digits than its factorization.

7428881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437010.

The product of its digits is 28672, while the sum is 38.

The square root of 7428881 is about 2725.5973657164. The cubic root of 7428881 is about 195.1227016487.

The spelling of 7428881 in words is "seven million, four hundred twenty-eight thousand, eight hundred eighty-one".