74584721 has 2 divisors, whose sum is σ = 74584722. Its totient is φ = 74584720.

The previous prime is 74584703. The next prime is 74584753. The reversal of 74584721 is 12748547.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74580496 + 4225 = 8636^2 + 65^2 .

It is a cyclic number.

It is not a de Polignac number, because 74584721 - 2²² = 70390417 is a prime.

It is not a weakly prime, because it can be changed into another prime (74584771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37292360 + 37292361.

It is an arithmetic number, because the mean of its divisors is an integer number (37292361).

Almost surely, 2^74584721 is an apocalyptic number.

It is an amenable number.

74584721 is a deficient number, since it is larger than the sum of its proper divisors (1).

74584721 is an equidigital number, since it uses as much as digits as its factorization.

74584721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62720, while the sum is 38.

The square root of 74584721 is about 8636.2446120985. The cubic root of 74584721 is about 420.9365363420.

The spelling of 74584721 in words is "seventy-four million, five hundred eighty-four thousand, seven hundred twenty-one".