73356781 has 4 divisors (see below), whose sum is σ = 73381500. Its totient is φ = 73332064.

The previous prime is 73356779. The next prime is 73356809. The reversal of 73356781 is 18765337.

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 15139881 + 58216900 = 3891^2 + 7630^2 .

It is a cyclic number.

It is not a de Polignac number, because 73356781 - 2¹ = 73356779 is a prime.

It is a super-2 number, since 2×73356781² = 10762434637363922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73356721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7186 + ... + 14083.

It is an arithmetic number, because the mean of its divisors is an integer number (18345375).

Almost surely, 2^73356781 is an apocalyptic number.

It is an amenable number.

73356781 is a deficient number, since it is larger than the sum of its proper divisors (24719).

73356781 is a wasteful number, since it uses less digits than its factorization.

73356781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24718.

The product of its digits is 105840, while the sum is 40.

The square root of 73356781 is about 8564.8573251397. The cubic root of 73356781 is about 418.6136850134.

The spelling of 73356781 in words is "seventy-three million, three hundred fifty-six thousand, seven hundred eighty-one".