73706639 has 4 divisors (see below), whose sum is σ = 74114040. Its totient is φ = 73299240.

The previous prime is 73706599. The next prime is 73706641. The reversal of 73706639 is 93660737.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93660737 = 673 ⋅139169.

It is a cyclic number.

It is not a de Polignac number, because 73706639 - 2⁸ = 73706383 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 73706596 and 73706605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73706839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203429 + ... + 203790.

It is an arithmetic number, because the mean of its divisors is an integer number (18528510).

Almost surely, 2^73706639 is an apocalyptic number.

73706639 is a deficient number, since it is larger than the sum of its proper divisors (407401).

73706639 is a wasteful number, since it uses less digits than its factorization.

73706639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407400.

The product of its (nonzero) digits is 142884, while the sum is 41.

The square root of 73706639 is about 8585.2570724469. The cubic root of 73706639 is about 419.2781231716.

The spelling of 73706639 in words is "seventy-three million, seven hundred six thousand, six hundred thirty-nine".