73123987 has 4 divisors (see below), whose sum is σ = 77425416. Its totient is φ = 68822560.

The previous prime is 73123961. The next prime is 73123991. The reversal of 73123987 is 78932137.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 73123987 - 2⁷ = 73123859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73123927) 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, 2150689 + ... + 2150722.

It is an arithmetic number, because the mean of its divisors is an integer number (19356354).

Almost surely, 2^73123987 is an apocalyptic number.

73123987 is a deficient number, since it is larger than the sum of its proper divisors (4301429).

73123987 is a wasteful number, since it uses less digits than its factorization.

73123987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4301428.

The product of its digits is 63504, while the sum is 40.

The square root of 73123987 is about 8551.2564573868. The cubic root of 73123987 is about 418.1703993803.

The spelling of 73123987 in words is "seventy-three million, one hundred twenty-three thousand, nine hundred eighty-seven".