73442513 has 4 divisors (see below), whose sum is σ = 73653300. Its totient is φ = 73231728.

The previous prime is 73442507. The next prime is 73442531. The reversal of 73442513 is 31524437.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31524437 = 7 ⋅4503491.

It can be written as a sum of positive squares in 2 ways, for example, as 57942544 + 15499969 = 7612^2 + 3937^2 .

It is a cyclic number.

It is not a de Polignac number, because 73442513 - 2¹⁶ = 73376977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (73442563) 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, 104870 + ... + 105567.

It is an arithmetic number, because the mean of its divisors is an integer number (18413325).

Almost surely, 2^73442513 is an apocalyptic number.

It is an amenable number.

73442513 is a deficient number, since it is larger than the sum of its proper divisors (210787).

73442513 is a wasteful number, since it uses less digits than its factorization.

73442513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210786.

The product of its digits is 10080, while the sum is 29.

The square root of 73442513 is about 8569.8607339910. The cubic root of 73442513 is about 418.7766993298.

The spelling of 73442513 in words is "seventy-three million, four hundred forty-two thousand, five hundred thirteen".