328212749 has 8 divisors (see below), whose sum is σ = 347812920. Its totient is φ = 309164800.

The previous prime is 328212721. The next prime is 328212769. The reversal of 328212749 is 947212823.

It can be written as a sum of positive squares in 4 ways, for example, as 31753225 + 296459524 = 5635^2 + 17218^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 328212749 - 2²⁸ = 59777293 is a prime.

It is a super-2 number, since 2×328212749² = 215447217212274002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (328212769) 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, 136832 + ... + 139209.

It is an arithmetic number, because the mean of its divisors is an integer number (43476615).

Almost surely, 2^328212749 is an apocalyptic number.

It is an amenable number.

328212749 is a deficient number, since it is larger than the sum of its proper divisors (19600171).

328212749 is a wasteful number, since it uses less digits than its factorization.

328212749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276111.

The product of its digits is 48384, while the sum is 38.

The square root of 328212749 is about 18116.6428733361. The cubic root of 328212749 is about 689.7925225106.

The spelling of 328212749 in words is "three hundred twenty-eight million, two hundred twelve thousand, seven hundred forty-nine".