73969649 has 4 divisors (see below), whose sum is σ = 79659636. Its totient is φ = 68279664.

The previous prime is 73969619. The next prime is 73969661. The reversal of 73969649 is 94696937.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94696937 = 7393 ⋅12809.

It can be written as a sum of positive squares in 2 ways, for example, as 36820624 + 37149025 = 6068^2 + 6095^2 .

It is a cyclic number.

It is not a de Polignac number, because 73969649 - 2²⁰ = 72921073 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 73969649.

It is not an unprimeable number, because it can be changed into a prime (73969619) 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, 2844974 + ... + 2844999.

It is an arithmetic number, because the mean of its divisors is an integer number (19914909).

Almost surely, 2^73969649 is an apocalyptic number.

It is an amenable number.

73969649 is a deficient number, since it is larger than the sum of its proper divisors (5689987).

73969649 is a wasteful number, since it uses less digits than its factorization.

73969649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5689986.

The product of its digits is 2204496, while the sum is 53.

The square root of 73969649 is about 8600.5609700763. The cubic root of 73969649 is about 419.7762394644.

The spelling of 73969649 in words is "seventy-three million, nine hundred sixty-nine thousand, six hundred forty-nine".