73428773 has 4 divisors (see below), whose sum is σ = 80104128. Its totient is φ = 66753420.

The previous prime is 73428769. The next prime is 73428791. The reversal of 73428773 is 37782437.

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.

It is a cyclic number.

It is not a de Polignac number, because 73428773 - 2² = 73428769 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 73428773.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73428703) 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, 3337661 + ... + 3337682.

It is an arithmetic number, because the mean of its divisors is an integer number (20026032).

Almost surely, 2^73428773 is an apocalyptic number.

It is an amenable number.

73428773 is a deficient number, since it is larger than the sum of its proper divisors (6675355).

73428773 is a wasteful number, since it uses less digits than its factorization.

73428773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6675354.

The product of its digits is 197568, while the sum is 41.

The square root of 73428773 is about 8569.0590498607. The cubic root of 73428773 is about 418.7505820739.

The spelling of 73428773 in words is "seventy-three million, four hundred twenty-eight thousand, seven hundred seventy-three".