74400649 has 4 divisors (see below), whose sum is σ = 75167764. Its totient is φ = 73633536.

The previous prime is 74400643. The next prime is 74400679. The reversal of 74400649 is 94600447.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94600447 = 61 ⋅1550827.

It can be written as a sum of positive squares in 2 ways, for example, as 41990400 + 32410249 = 6480^2 + 5693^2 .

It is a cyclic number.

It is not a de Polignac number, because 74400649 - 2¹⁷ = 74269577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74400643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 383412 + ... + 383605.

It is an arithmetic number, because the mean of its divisors is an integer number (18791941).

Almost surely, 2^74400649 is an apocalyptic number.

It is an amenable number.

74400649 is a deficient number, since it is larger than the sum of its proper divisors (767115).

74400649 is an equidigital number, since it uses as much as digits as its factorization.

74400649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 767114.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 74400649 is about 8625.5810818750. The cubic root of 74400649 is about 420.5899664372.

The spelling of 74400649 in words is "seventy-four million, four hundred thousand, six hundred forty-nine".