73999999 has 4 divisors (see below), whose sum is σ = 74017336. Its totient is φ = 73982664.

The previous prime is 73999969. The next prime is 74000051. The reversal of 73999999 is 99999937.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 99999937 = 37 ⋅2702701.

It is a cyclic number.

It is not a de Polignac number, because 73999999 - 2¹³ = 73991807 is a prime.

It is a Duffinian number.

73999999 is a modest number, since divided by 9999 gives 7399 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 73999999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73999969) 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, 2737 + ... + 12469.

It is an arithmetic number, because the mean of its divisors is an integer number (18504334).

Almost surely, 2^73999999 is an apocalyptic number.

73999999 is a deficient number, since it is larger than the sum of its proper divisors (17337).

73999999 is an equidigital number, since it uses as much as digits as its factorization.

73999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17336.

The product of its digits is 11160261, while the sum is 64.

The square root of 73999999 is about 8602.3252089188. The cubic root of 73999999 is about 419.8336434897.

It can be divided in two parts, 73 and 999999, that multiplied together give a palindrome (72999927).

The spelling of 73999999 in words is "seventy-three million, nine hundred ninety-nine thousand, nine hundred ninety-nine".