8420720 has 80 divisors (see below), whose sum is σ = 24427008. Its totient is φ = 2622720.

The previous prime is 8420681. The next prime is 8420749. The reversal of 8420720 is 270248.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5477 + ... + 6843.

Almost surely, 2^8420720 is an apocalyptic number.

8420720 is a gapful number since it is divisible by the number (80) 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 8420720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12213504).

8420720 is an abundant number, since it is smaller than the sum of its proper divisors (16006288).

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

8420720 is a wasteful number, since it uses less digits than its factorization.

8420720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1398 (or 1392 counting only the distinct ones).

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

The square root of 8420720 is about 2901.8476872503. The cubic root of 8420720 is about 203.4462748584.

Adding to 8420720 its reverse (270248), we get a palindrome (8690968).

The spelling of 8420720 in words is "eight million, four hundred twenty thousand, seven hundred twenty".