73998569 has 4 divisors (see below), whose sum is σ = 78351444. Its totient is φ = 69645696.

The previous prime is 73998553. The next prime is 73998593. The reversal of 73998569 is 96589937.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96589937 = 17 ⋅5681761.

It can be written as a sum of positive squares in 2 ways, for example, as 67848169 + 6150400 = 8237^2 + 2480^2 .

It is a cyclic number.

It is not a de Polignac number, because 73998569 - 2⁴ = 73998553 is a prime.

It is a super-2 number, since 2×73998569² = 10951576428095522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (73991569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2176412 + ... + 2176445.

It is an arithmetic number, because the mean of its divisors is an integer number (19587861).

Almost surely, 2^73998569 is an apocalyptic number.

It is an amenable number.

73998569 is a deficient number, since it is larger than the sum of its proper divisors (4352875).

73998569 is a wasteful number, since it uses less digits than its factorization.

73998569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4352874.

The product of its digits is 3674160, while the sum is 56.

The square root of 73998569 is about 8602.2420914550. The cubic root of 73998569 is about 419.8309391384.

The spelling of 73998569 in words is "seventy-three million, nine hundred ninety-eight thousand, five hundred sixty-nine".