9661620 has 48 divisors (see below), whose sum is σ = 27195840. Its totient is φ = 2562816.

The previous prime is 9661583. The next prime is 9661637. The reversal of 9661620 is 261669.

9661620 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16696 + ... + 17264.

It is an arithmetic number, because the mean of its divisors is an integer number (566580).

Almost surely, 2^9661620 is an apocalyptic number.

It is an amenable number.

9661620 is an abundant number, since it is smaller than the sum of its proper divisors (17534220).

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

9661620 is a wasteful number, since it uses less digits than its factorization.

9661620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864 (or 862 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 9661620 is about 3108.3146558867. The cubic root of 9661620 is about 212.9854736727.

It can be divided in two parts, 96 and 61620, that added together give a palindrome (61716).

The spelling of 9661620 in words is "nine million, six hundred sixty-one thousand, six hundred twenty".