73073681 has 4 divisors (see below), whose sum is σ = 73138212. Its totient is φ = 73009152.

The previous prime is 73073653. The next prime is 73073699. The reversal of 73073681 is 18637037.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24910081 + 48163600 = 4991^2 + 6940^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73073681 is a prime.

It is a super-2 number, since 2×73073681² = 10679525709779522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73073621) 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, 30536 + ... + 32841.

It is an arithmetic number, because the mean of its divisors is an integer number (18284553).

Almost surely, 2^73073681 is an apocalyptic number.

It is an amenable number.

73073681 is a deficient number, since it is larger than the sum of its proper divisors (64531).

73073681 is a wasteful number, since it uses less digits than its factorization.

73073681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64530.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 73073681 is about 8548.3145122299. The cubic root of 73073681 is about 418.0744832664.

The spelling of 73073681 in words is "seventy-three million, seventy-three thousand, six hundred eighty-one".