81630710 has 16 divisors (see below), whose sum is σ = 167926176. Its totient is φ = 27987648.

The previous prime is 81630697. The next prime is 81630739. The reversal of 81630710 is 1703618.

It is a self number, because there is not a number n which added to its sum of digits gives 81630710.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 583007 + ... + 583146.

It is an arithmetic number, because the mean of its divisors is an integer number (10495386).

Almost surely, 2^81630710 is an apocalyptic number.

81630710 is an abundant number, since it is smaller than the sum of its proper divisors (86295466).

81630710 is a wasteful number, since it uses less digits than its factorization.

81630710 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1166167.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 81630710 is about 9034.9714996783. The cubic root of 81630710 is about 433.7949826974.

The spelling of 81630710 in words is "eighty-one million, six hundred thirty thousand, seven hundred ten".