74578321 has 2 divisors, whose sum is σ = 74578322. Its totient is φ = 74578320.

The previous prime is 74578313. The next prime is 74578369. The reversal of 74578321 is 12387547.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73702225 + 876096 = 8585^2 + 936^2 .

It is a cyclic number.

It is not a de Polignac number, because 74578321 - 2³ = 74578313 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (74575321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37289160 + 37289161.

It is an arithmetic number, because the mean of its divisors is an integer number (37289161).

Almost surely, 2^74578321 is an apocalyptic number.

It is an amenable number.

74578321 is a deficient number, since it is larger than the sum of its proper divisors (1).

74578321 is an equidigital number, since it uses as much as digits as its factorization.

74578321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47040, while the sum is 37.

The square root of 74578321 is about 8635.8740727271. The cubic root of 74578321 is about 420.9244960257.

The spelling of 74578321 in words is "seventy-four million, five hundred seventy-eight thousand, three hundred twenty-one".