8720946 has 80 divisors (see below), whose sum is σ = 21771288. Its totient is φ = 2592000.

The previous prime is 8720941. The next prime is 8720947. The reversal of 8720946 is 6490278.

It can be written as a sum of positive squares in 4 ways, for example, as 6125625 + 2595321 = 2475^2 + 1611^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 8720946.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8720941) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 86296 + ... + 86396.

Almost surely, 2^8720946 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8720946, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10885644).

8720946 is an abundant number, since it is smaller than the sum of its proper divisors (13050342).

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

8720946 is a wasteful number, since it uses less digits than its factorization.

8720946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169 (or 160 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 8720946 is about 2953.1247857143. The cubic root of 8720946 is about 205.8359362315.

The spelling of 8720946 in words is "eight million, seven hundred twenty thousand, nine hundred forty-six".