73663729 has 4 divisors (see below), whose sum is σ = 73903984. Its totient is φ = 73423476.

The previous prime is 73663727. The next prime is 73663769. The reversal of 73663729 is 92736637.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 92736637 = 7 ⋅13248091.

It is a cyclic number.

It is not a de Polignac number, because 73663729 - 2¹ = 73663727 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73663727) 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, 119667 + ... + 120280.

It is an arithmetic number, because the mean of its divisors is an integer number (18475996).

Almost surely, 2^73663729 is an apocalyptic number.

It is an amenable number.

73663729 is a deficient number, since it is larger than the sum of its proper divisors (240255).

73663729 is a wasteful number, since it uses less digits than its factorization.

73663729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240254.

The product of its digits is 285768, while the sum is 43.

The square root of 73663729 is about 8582.7576570704. The cubic root of 73663729 is about 419.1967432716.

The spelling of 73663729 in words is "seventy-three million, six hundred sixty-three thousand, seven hundred twenty-nine".