7280420 has 144 divisors (see below), whose sum is σ = 20684160. Its totient is φ = 2128896.

The previous prime is 7280417. The next prime is 7280461. The reversal of 7280420 is 240827.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is an Ulam number.

It is a nialpdrome in base 14.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 316529 + ... + 316551.

It is an arithmetic number, because the mean of its divisors is an integer number (143640).

Almost surely, 2^7280420 is an apocalyptic number.

7280420 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7280420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10342080).

7280420 is an abundant number, since it is smaller than the sum of its proper divisors (13403740).

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

7280420 is a wasteful number, since it uses less digits than its factorization.

7280420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82 (or 73 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 7280420 is about 2698.2253427021. The cubic root of 7280420 is about 193.8141487205.

The spelling of 7280420 in words is "seven million, two hundred eighty thousand, four hundred twenty".