81630286 has 8 divisors (see below), whose sum is σ = 122572944. Its totient is φ = 40772640.

The previous prime is 81630257. The next prime is 81630287. The reversal of 81630286 is 68203618.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81630287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18795 + ... + 22726.

It is an arithmetic number, because the mean of its divisors is an integer number (15321618).

Almost surely, 2^81630286 is an apocalyptic number.

81630286 is a deficient number, since it is larger than the sum of its proper divisors (40942658).

81630286 is a wasteful number, since it uses less digits than its factorization.

81630286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42506.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 81630286 is about 9034.9480352684. The cubic root of 81630286 is about 433.7942316345.

The spelling of 81630286 in words is "eighty-one million, six hundred thirty thousand, two hundred eighty-six".