81630234 has 32 divisors (see below), whose sum is σ = 207315840. Its totient is φ = 23322816.

The previous prime is 81630181. The next prime is 81630247. The reversal of 81630234 is 43203618.

It is a happy number.

81630234 is a `hidden beast` number, since 8 + 1 + 630 + 23 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 81630198 and 81630207.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 107599 + ... + 108354.

It is an arithmetic number, because the mean of its divisors is an integer number (6478620).

Almost surely, 2^81630234 is an apocalyptic number.

81630234 is an abundant number, since it is smaller than the sum of its proper divisors (125685606).

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

81630234 is a wasteful number, since it uses less digits than its factorization.

81630234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215971 (or 215965 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 81630234 is about 9034.9451575535. The cubic root of 81630234 is about 433.7941395228.

The spelling of 81630234 in words is "eighty-one million, six hundred thirty thousand, two hundred thirty-four".