9862640 has 40 divisors (see below), whose sum is σ = 23154768. Its totient is φ = 3906560.

The previous prime is 9862637. The next prime is 9862649. The reversal of 9862640 is 462689.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 9862640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9862649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8495 + ... + 9585.

Almost surely, 2^9862640 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 9862640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11577384).

9862640 is an abundant number, since it is smaller than the sum of its proper divisors (13292128).

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

9862640 is a wasteful number, since it uses less digits than its factorization.

9862640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1217 (or 1211 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 9862640 is about 3140.4840391252. The cubic root of 9862640 is about 214.4524737901.

The spelling of 9862640 in words is "nine million, eight hundred sixty-two thousand, six hundred forty".