7281018 has 48 divisors (see below), whose sum is σ = 16885440. Its totient is φ = 2261952.

The previous prime is 7281011. The next prime is 7281031. The reversal of 7281018 is 8101827.

It is a junction number, because it is equal to n+sod(n) for n = 7280982 and 7281000.

It is not an unprimeable number, because it can be changed into a prime (7281011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17598 + ... + 18006.

It is an arithmetic number, because the mean of its divisors is an integer number (351780).

Almost surely, 2^7281018 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7281018, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8442720).

7281018 is an abundant number, since it is smaller than the sum of its proper divisors (9604422).

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

7281018 is a wasteful number, since it uses less digits than its factorization.

7281018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483 (or 480 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

The square root of 7281018 is about 2698.3361540031. The cubic root of 7281018 is about 193.8194550850.

The spelling of 7281018 in words is "seven million, two hundred eighty-one thousand, eighteen".