73911813 has 4 divisors (see below), whose sum is σ = 98549088. Its totient is φ = 49274540.

The previous prime is 73911793. The next prime is 73911833. The reversal of 73911813 is 31811937.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31811937 = 3 ⋅10603979.

It is an interprime number because it is at equal distance from previous prime (73911793) and next prime (73911833).

It is a cyclic number.

It is not a de Polignac number, because 73911813 - 2⁸ = 73911557 is a prime.

It is a super-2 number, since 2×73911813² = 10925912201893938, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73911833) by changing a digit.

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, 12318633 + ... + 12318638.

It is an arithmetic number, because the mean of its divisors is an integer number (24637272).

Almost surely, 2^73911813 is an apocalyptic number.

It is an amenable number.

73911813 is a deficient number, since it is larger than the sum of its proper divisors (24637275).

73911813 is a wasteful number, since it uses less digits than its factorization.

73911813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24637274.

The product of its digits is 4536, while the sum is 33.

The square root of 73911813 is about 8597.1979737587. The cubic root of 73911813 is about 419.6668049000. Note that the first 3 decimals are identical.

The spelling of 73911813 in words is "seventy-three million, nine hundred eleven thousand, eight hundred thirteen".