328007381 has 8 divisors (see below), whose sum is σ = 354758040. Its totient is φ = 301473792.

The previous prime is 328007359. The next prime is 328007387. The reversal of 328007381 is 183700823.

It can be written as a sum of positive squares in 4 ways, for example, as 20566225 + 307441156 = 4535^2 + 17534^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-328007381 is a prime.

It is a super-2 number, since 2×328007381² = 215177683980958322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (328007387) 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, 51116 + ... + 57173.

It is an arithmetic number, because the mean of its divisors is an integer number (44344755).

Almost surely, 2^328007381 is an apocalyptic number.

It is an amenable number.

328007381 is a deficient number, since it is larger than the sum of its proper divisors (26750659).

328007381 is a wasteful number, since it uses less digits than its factorization.

328007381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108535.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 328007381 is about 18110.9740489020. The cubic root of 328007381 is about 689.6486210645.

The spelling of 328007381 in words is "three hundred twenty-eight million, seven thousand, three hundred eighty-one".