73813645 has 4 divisors (see below), whose sum is σ = 88576380. Its totient is φ = 59050912.

The previous prime is 73813639. The next prime is 73813679. The reversal of 73813645 is 54631837.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54631837 = 13 ⋅4202449.

It can be written as a sum of positive squares in 2 ways, for example, as 24068836 + 49744809 = 4906^2 + 7053^2 .

It is a cyclic number.

It is not a de Polignac number, because 73813645 - 2³ = 73813637 is a prime.

It is a super-3 number, since 3×73813645³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

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, 7381360 + ... + 7381369.

It is an arithmetic number, because the mean of its divisors is an integer number (22144095).

Almost surely, 2^73813645 is an apocalyptic number.

It is an amenable number.

73813645 is a deficient number, since it is larger than the sum of its proper divisors (14762735).

73813645 is a wasteful number, since it uses less digits than its factorization.

73813645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14762734.

The product of its digits is 60480, while the sum is 37.

The square root of 73813645 is about 8591.4867747090. The cubic root of 73813645 is about 419.4809252593.

It can be divided in two parts, 7381 and 3645, that added together give a triangular number (11026 = T₁₄₈).

The spelling of 73813645 in words is "seventy-three million, eight hundred thirteen thousand, six hundred forty-five".