73890013 has 4 divisors (see below), whose sum is σ = 73988380. Its totient is φ = 73791648.

The previous prime is 73889989. The next prime is 73890017. The reversal of 73890013 is 31009837.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31009837 = 43 ⋅721159.

It can be written as a sum of positive squares in 2 ways, for example, as 39162564 + 34727449 = 6258^2 + 5893^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73890013 is a prime.

It is a super-2 number, since 2×73890013² = 10919468042280338, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73890017) 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, 48048 + ... + 49561.

It is an arithmetic number, because the mean of its divisors is an integer number (18497095).

Almost surely, 2^73890013 is an apocalyptic number.

It is an amenable number.

73890013 is a deficient number, since it is larger than the sum of its proper divisors (98367).

73890013 is an equidigital number, since it uses as much as digits as its factorization.

73890013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98366.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 73890013 is about 8595.9300253085. The cubic root of 73890013 is about 419.6255411489.

The spelling of 73890013 in words is "seventy-three million, eight hundred ninety thousand, thirteen".