81634485 has 16 divisors (see below), whose sum is σ = 133801920. Its totient is φ = 42476160.

The previous prime is 81634471. The next prime is 81634499. The reversal of 81634485 is 58443618.

It is an interprime number because it is at equal distance from previous prime (81634471) and next prime (81634499).

It is not a de Polignac number, because 81634485 - 2⁵ = 81634453 is a prime.

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, 65755 + ... + 66984.

It is an arithmetic number, because the mean of its divisors is an integer number (8362620).

Almost surely, 2^81634485 is an apocalyptic number.

It is an amenable number.

81634485 is a deficient number, since it is larger than the sum of its proper divisors (52167435).

81634485 is a wasteful number, since it uses less digits than its factorization.

81634485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132788.

The product of its digits is 92160, while the sum is 39.

The square root of 81634485 is about 9035.1804077174. The cubic root of 81634485 is about 433.8016695224.

The spelling of 81634485 in words is "eighty-one million, six hundred thirty-four thousand, four hundred eighty-five".