81630735 has 8 divisors (see below), whose sum is σ = 130609200. Its totient is φ = 43536384.

The previous prime is 81630697. The next prime is 81630739. The reversal of 81630735 is 53703618.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81630735 - 2⁷ = 81630607 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81630696 and 81630705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81630739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2721010 + ... + 2721039.

It is an arithmetic number, because the mean of its divisors is an integer number (16326150).

Almost surely, 2^81630735 is an apocalyptic number.

81630735 is a deficient number, since it is larger than the sum of its proper divisors (48978465).

81630735 is a wasteful number, since it uses less digits than its factorization.

81630735 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5442057.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 81630735 is about 9034.9728831912. The cubic root of 81630735 is about 433.7950269816.

The spelling of 81630735 in words is "eighty-one million, six hundred thirty thousand, seven hundred thirty-five".