73036781 has 4 divisors (see below), whose sum is σ = 73404000. Its totient is φ = 72669564.

The previous prime is 73036729. The next prime is 73036793. The reversal of 73036781 is 18763037.

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: 18763037 = 1549 ⋅12113.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73036781 is a prime.

It is a super-2 number, since 2×73036781² = 10668742757683922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73036721) 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, 183311 + ... + 183708.

It is an arithmetic number, because the mean of its divisors is an integer number (18351000).

Almost surely, 2^73036781 is an apocalyptic number.

It is an amenable number.

73036781 is a deficient number, since it is larger than the sum of its proper divisors (367219).

73036781 is a wasteful number, since it uses less digits than its factorization.

73036781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367218.

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

The square root of 73036781 is about 8546.1559194763. The cubic root of 73036781 is about 418.0040997591.

The spelling of 73036781 in words is "seventy-three million, thirty-six thousand, seven hundred eighty-one".