321616738 has 8 divisors (see below), whose sum is σ = 482656860. Its totient is φ = 160731120.

The previous prime is 321616733. The next prime is 321616753. The reversal of 321616738 is 837616123.

It can be written as a sum of positive squares in 2 ways, for example, as 246395809 + 75220929 = 15697^2 + 8673^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 321616697 and 321616706.

It is not an unprimeable number, because it can be changed into a prime (321616733) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33273 + ... + 41836.

Almost surely, 2^321616738 is an apocalyptic number.

321616738 is a deficient number, since it is larger than the sum of its proper divisors (161040122).

321616738 is a wasteful number, since it uses less digits than its factorization.

321616738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77252.

The product of its digits is 36288, while the sum is 37.

The square root of 321616738 is about 17933.6760871830. The cubic root of 321616738 is about 685.1403537858.

The spelling of 321616738 in words is "three hundred twenty-one million, six hundred sixteen thousand, seven hundred thirty-eight".