73307681 has 4 divisors (see below), whose sum is σ = 77166000. Its totient is φ = 69449364.

The previous prime is 73307671. The next prime is 73307683. The reversal of 73307681 is 18670337.

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: 18670337 = 7 ⋅2667191.

It is a cyclic number.

It is not a de Polignac number, because 73307681 - 2⁶ = 73307617 is a prime.

It is a super-2 number, since 2×73307681² = 10748032187195522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73307683) 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, 1929131 + ... + 1929168.

It is an arithmetic number, because the mean of its divisors is an integer number (19291500).

Almost surely, 2^73307681 is an apocalyptic number.

It is an amenable number.

73307681 is a deficient number, since it is larger than the sum of its proper divisors (3858319).

73307681 is a wasteful number, since it uses less digits than its factorization.

73307681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3858318.

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

The square root of 73307681 is about 8561.9904811907. The cubic root of 73307681 is about 418.5202670673.

The spelling of 73307681 in words is "seventy-three million, three hundred seven thousand, six hundred eighty-one".