8402720 has 24 divisors (see below), whose sum is σ = 19851804. Its totient is φ = 3361024.

The previous prime is 8402717. The next prime is 8402747. The reversal of 8402720 is 272048.

It can be written as a sum of positive squares in 2 ways, for example, as 8317456 + 85264 = 2884^2 + 292^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26099 + ... + 26418.

Almost surely, 2^8402720 is an apocalyptic number.

8402720 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8402720 is an abundant number, since it is smaller than the sum of its proper divisors (11449084).

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

8402720 is a wasteful number, since it uses less digits than its factorization.

8402720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52532 (or 52524 counting only the distinct ones).

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

The square root of 8402720 is about 2898.7445558379. The cubic root of 8402720 is about 203.3012102498.

Adding to 8402720 its reverse (272048), we get a palindrome (8674768).

The spelling of 8402720 in words is "eight million, four hundred two thousand, seven hundred twenty".