9621640 has 48 divisors (see below), whose sum is σ = 25188300. Its totient is φ = 3298176.

The previous prime is 9621617. The next prime is 9621641. The reversal of 9621640 is 461269.

It can be written as a sum of positive squares in 2 ways, for example, as 8892324 + 729316 = 2982^2 + 854^2 .

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 9621599 and 9621608.

It is not an unprimeable number, because it can be changed into a prime (9621641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 495 + ... + 4414.

Almost surely, 2^9621640 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 9621640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12594150).

9621640 is an abundant number, since it is smaller than the sum of its proper divisors (15566660).

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

9621640 is a wasteful number, since it uses less digits than its factorization.

9621640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4934 (or 4923 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 9621640 is about 3101.8768511983. The cubic root of 9621640 is about 212.6912879626.

It can be divided in two parts, 96 and 21640, that added together give a triangular number (21736 = T₂₀₈).

The spelling of 9621640 in words is "nine million, six hundred twenty-one thousand, six hundred forty".