9961620 has 24 divisors (see below), whose sum is σ = 27892704. Its totient is φ = 2656416.

The previous prime is 9961613. The next prime is 9961631. The reversal of 9961620 is 261699.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82954 + ... + 83073.

It is an arithmetic number, because the mean of its divisors is an integer number (1162196).

Almost surely, 2^9961620 is an apocalyptic number.

It is an amenable number.

9961620 is an abundant number, since it is smaller than the sum of its proper divisors (17931084).

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

9961620 is a wasteful number, since it uses less digits than its factorization.

9961620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166039 (or 166037 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 9961620 is about 3156.2034154978. The cubic root of 9961620 is about 215.1674916231.

The spelling of 9961620 in words is "nine million, nine hundred sixty-one thousand, six hundred twenty".