73666636 has 12 divisors (see below), whose sum is σ = 130683112. Its totient is φ = 36328608.

The previous prime is 73666613. The next prime is 73666639. The reversal of 73666636 is 63666637.

73666636 = T₁₃₈₄ + T₁₃₈₅ + ... + T₁₄₅₆.

It is a junction number, because it is equal to n+sod(n) for n = 73666592 and 73666601.

It is not an unprimeable number, because it can be changed into a prime (73666639) 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, 125850 + ... + 126433.

Almost surely, 2^73666636 is an apocalyptic number.

It is an amenable number.

73666636 is a deficient number, since it is larger than the sum of its proper divisors (57016476).

73666636 is a wasteful number, since it uses less digits than its factorization.

73666636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252360 (or 252358 counting only the distinct ones).

The product of its digits is 489888, while the sum is 43.

The square root of 73666636 is about 8582.9270065637. The cubic root of 73666636 is about 419.2022574685.

Subtracting from 73666636 its reverse (63666637), we obtain a palindrome (9999999).

The spelling of 73666636 in words is "seventy-three million, six hundred sixty-six thousand, six hundred thirty-six".