8729420 has 48 divisors (see below), whose sum is σ = 21869568. Its totient is φ = 2861760.

The previous prime is 8729411. The next prime is 8729429. The reversal of 8729420 is 249278.

8729420 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (8729411) and next prime (8729429).

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (8729429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1865 + ... + 4575.

It is an arithmetic number, because the mean of its divisors is an integer number (455616).

Almost surely, 2^8729420 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 8729420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10934784).

8729420 is an abundant number, since it is smaller than the sum of its proper divisors (13140148).

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

8729420 is a wasteful number, since it uses less digits than its factorization.

8729420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2750 (or 2748 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 8729420 is about 2954.5591887793. The cubic root of 8729420 is about 205.9025837823.

The spelling of 8729420 in words is "eight million, seven hundred twenty-nine thousand, four hundred twenty".