73321865 has 4 divisors (see below), whose sum is σ = 87986244. Its totient is φ = 58657488.

The previous prime is 73321847. The next prime is 73321877. The reversal of 73321865 is 56812337.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56812337 = 19 ⋅2990123.

It can be written as a sum of positive squares in 2 ways, for example, as 17774656 + 55547209 = 4216^2 + 7453^2 .

It is a cyclic number.

It is not a de Polignac number, because 73321865 - 2¹⁴ = 73305481 is a prime.

It is a Duffinian 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, 7332182 + ... + 7332191.

It is an arithmetic number, because the mean of its divisors is an integer number (21996561).

Almost surely, 2^73321865 is an apocalyptic number.

It is an amenable number.

73321865 is a deficient number, since it is larger than the sum of its proper divisors (14664379).

73321865 is a wasteful number, since it uses less digits than its factorization.

73321865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14664378.

The product of its digits is 30240, while the sum is 35.

The square root of 73321865 is about 8562.8187531910. The cubic root of 73321865 is about 418.5472579117.

The spelling of 73321865 in words is "seventy-three million, three hundred twenty-one thousand, eight hundred sixty-five".