81634246 has 8 divisors (see below), whose sum is σ = 126673920. Its totient is φ = 39409608.

The previous prime is 81634243. The next prime is 81634249. The reversal of 81634246 is 64243618.

It is an interprime number because it is at equal distance from previous prime (81634243) and next prime (81634249).

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 (81634243) 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, 703686 + ... + 703801.

It is an arithmetic number, because the mean of its divisors is an integer number (15834240).

Almost surely, 2^81634246 is an apocalyptic number.

81634246 is the 4830-th centered heptagonal number.

81634246 is a deficient number, since it is larger than the sum of its proper divisors (45039674).

81634246 is a wasteful number, since it uses less digits than its factorization.

81634246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1407518.

The product of its digits is 27648, while the sum is 34.

The square root of 81634246 is about 9035.1671816298. The cubic root of 81634246 is about 433.8012461772.

The spelling of 81634246 in words is "eighty-one million, six hundred thirty-four thousand, two hundred forty-six".