74689649 has 4 divisors (see below), whose sum is σ = 75076836. Its totient is φ = 74302464.

The previous prime is 74689639. The next prime is 74689661. The reversal of 74689649 is 94698647.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94698647 = 137 ⋅691231.

It can be written as a sum of positive squares in 2 ways, for example, as 33640000 + 41049649 = 5800^2 + 6407^2 .

It is a cyclic number.

It is not a de Polignac number, because 74689649 - 2¹² = 74685553 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 74689649.

It is not an unprimeable number, because it can be changed into a prime (74689609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193304 + ... + 193689.

It is an arithmetic number, because the mean of its divisors is an integer number (18769209).

Almost surely, 2^74689649 is an apocalyptic number.

It is an amenable number.

74689649 is a deficient number, since it is larger than the sum of its proper divisors (387187).

74689649 is a wasteful number, since it uses less digits than its factorization.

74689649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387186.

The product of its digits is 2612736, while the sum is 53.

The square root of 74689649 is about 8642.3173396954. The cubic root of 74689649 is about 421.1338391861.

The spelling of 74689649 in words is "seventy-four million, six hundred eighty-nine thousand, six hundred forty-nine".