321726740 has 12 divisors (see below), whose sum is σ = 675626196. Its totient is φ = 128690688.

The previous prime is 321726733. The next prime is 321726761. The reversal of 321726740 is 47627123.

It can be written as a sum of positive squares in 2 ways, for example, as 180687364 + 141039376 = 13442^2 + 11876^2 .

It is a junction number, because it is equal to n+sod(n) for n = 321726697 and 321726706.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8043149 + ... + 8043188.

It is an arithmetic number, because the mean of its divisors is an integer number (56302183).

Almost surely, 2^321726740 is an apocalyptic number.

It is an amenable number.

321726740 is an abundant number, since it is smaller than the sum of its proper divisors (353899456).

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

321726740 is a wasteful number, since it uses less digits than its factorization.

321726740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16086346 (or 16086344 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 32.

The square root of 321726740 is about 17936.7427366286. The cubic root of 321726740 is about 685.2184573268.

The spelling of 321726740 in words is "three hundred twenty-one million, seven hundred twenty-six thousand, seven hundred forty".