73681631 has 4 divisors (see below), whose sum is σ = 73814472. Its totient is φ = 73548792.

The previous prime is 73681609. The next prime is 73681649. The reversal of 73681631 is 13618637.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13618637 = 317 ⋅42961.

It is a cyclic number.

It is not a de Polignac number, because 73681631 - 2⁶ = 73681567 is a prime.

It is a super-2 number, since 2×73681631² = 10857965493640322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 73681591 and 73681600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73681681) 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, 65585 + ... + 66698.

It is an arithmetic number, because the mean of its divisors is an integer number (18453618).

Almost surely, 2^73681631 is an apocalyptic number.

73681631 is a deficient number, since it is larger than the sum of its proper divisors (132841).

73681631 is a wasteful number, since it uses less digits than its factorization.

73681631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132840.

The product of its digits is 18144, while the sum is 35.

The square root of 73681631 is about 8583.8004986137. The cubic root of 73681631 is about 419.2306987083.

The spelling of 73681631 in words is "seventy-three million, six hundred eighty-one thousand, six hundred thirty-one".