73659681 has 12 divisors (see below), whose sum is σ = 110066580. Its totient is φ = 47412960.

The previous prime is 73659661. The next prime is 73659727. The reversal of 73659681 is 18695637.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 12960000 + 60699681 = 3600^2 + 7791^2 .

It is not a de Polignac number, because 73659681 - 2⁶ = 73659617 is a prime.

It is a super-2 number, since 2×73659681² = 10851497210043522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (73659601) 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 11 ways as a sum of consecutive naturals, for example, 140850 + ... + 141371.

It is an arithmetic number, because the mean of its divisors is an integer number (9172215).

Almost surely, 2^73659681 is an apocalyptic number.

It is an amenable number.

73659681 is a deficient number, since it is larger than the sum of its proper divisors (36406899).

73659681 is a wasteful number, since it uses less digits than its factorization.

73659681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282256 (or 282253 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 73659681 is about 8582.5218321890. The cubic root of 73659681 is about 419.1890645061.

The spelling of 73659681 in words is "seventy-three million, six hundred fifty-nine thousand, six hundred eighty-one".