961938820 has 24 divisors (see below), whose sum is σ = 2031755544. Its totient is φ = 382550016.

The previous prime is 961938781. The next prime is 961938823. The reversal of 961938820 is 28839169.

It can be written as a sum of positive squares in 4 ways, for example, as 247873536 + 714065284 = 15744^2 + 26722^2 .

It is not an unprimeable number, because it can be changed into a prime (961938823) 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, 135549 + ... + 142468.

It is an arithmetic number, because the mean of its divisors is an integer number (84656481).

Almost surely, 2^961938820 is an apocalyptic number.

It is an amenable number.

961938820 is an abundant number, since it is smaller than the sum of its proper divisors (1069816724).

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

961938820 is a wasteful number, since it uses less digits than its factorization.

961938820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278199 (or 278197 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 46.

The square root of 961938820 is about 31015.1385616766. The cubic root of 961938820 is about 987.1484861156.

The spelling of 961938820 in words is "nine hundred sixty-one million, nine hundred thirty-eight thousand, eight hundred twenty".