73428815 has 4 divisors (see below), whose sum is σ = 88114584. Its totient is φ = 58743048.

The previous prime is 73428809. The next prime is 73428829. The reversal of 73428815 is 51882437.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51882437 = 31 ⋅1673627.

It is a cyclic number.

It is not a de Polignac number, because 73428815 - 2¹⁴ = 73412431 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7342877 + ... + 7342886.

It is an arithmetic number, because the mean of its divisors is an integer number (22028646).

Almost surely, 2^73428815 is an apocalyptic number.

73428815 is a deficient number, since it is larger than the sum of its proper divisors (14685769).

73428815 is a wasteful number, since it uses less digits than its factorization.

73428815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14685768.

The product of its digits is 53760, while the sum is 38.

The square root of 73428815 is about 8569.0615005379. The cubic root of 73428815 is about 418.7506619133.

The spelling of 73428815 in words is "seventy-three million, four hundred twenty-eight thousand, eight hundred fifteen".