81630670 has 32 divisors (see below), whose sum is σ = 160867296. Its totient is φ = 29577600.

The previous prime is 81630667. The next prime is 81630683. The reversal of 81630670 is 7603618.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33700 + ... + 36040.

It is an arithmetic number, because the mean of its divisors is an integer number (5027103).

Almost surely, 2^81630670 is an apocalyptic number.

81630670 is a deficient number, since it is larger than the sum of its proper divisors (79236626).

81630670 is a wasteful number, since it uses less digits than its factorization.

81630670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2676.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 81630670 is about 9034.9692860574. The cubic root of 81630670 is about 433.7949118425.

The spelling of 81630670 in words is "eighty-one million, six hundred thirty thousand, six hundred seventy".