8720040 has 96 divisors (see below), whose sum is σ = 30451680. Its totient is φ = 1991808.

The previous prime is 8720027. The next prime is 8720057. The reversal of 8720040 is 400278.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 8719989 and 8720016.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5139 + ... + 6621.

It is an arithmetic number, because the mean of its divisors is an integer number (317205).

Almost surely, 2^8720040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8720040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15225840).

8720040 is an abundant number, since it is smaller than the sum of its proper divisors (21731640).

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

8720040 is a wasteful number, since it uses less digits than its factorization.

8720040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1511 (or 1500 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 8720040 is about 2952.9713848935. The cubic root of 8720040 is about 205.8288080363.

The spelling of 8720040 in words is "eight million, seven hundred twenty thousand, forty".