81106630 has 64 divisors (see below), whose sum is σ = 169413120. Its totient is φ = 27648000.

The previous prime is 81106621. The next prime is 81106657. The reversal of 81106630 is 3660118.

It is a junction number, because it is equal to n+sod(n) for n = 81106595 and 81106604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 315462 + ... + 315718.

It is an arithmetic number, because the mean of its divisors is an integer number (2647080).

Almost surely, 2^81106630 is an apocalyptic number.

81106630 is an abundant number, since it is smaller than the sum of its proper divisors (88306490).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81106630 is a wasteful number, since it uses less digits than its factorization.

81106630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 81106630 is about 9005.9219405900. The cubic root of 81106630 is about 432.8646484233.

Adding to 81106630 its reverse (3660118), we get a palindrome (84766748).

The spelling of 81106630 in words is "eighty-one million, one hundred six thousand, six hundred thirty".