81636054 has 8 divisors (see below), whose sum is σ = 163272120. Its totient is φ = 27212016.

The previous prime is 81636053. The next prime is 81636077. The reversal of 81636054 is 45063618.

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

81636054 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81636053) 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, 6802999 + ... + 6803010.

It is an arithmetic number, because the mean of its divisors is an integer number (20409015).

Almost surely, 2^81636054 is an apocalyptic number.

81636054 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81636054 is a wasteful number, since it uses less digits than its factorization.

81636054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13606014.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 81636054 is about 9035.2672345648. The cubic root of 81636054 is about 433.8044487010.

The spelling of 81636054 in words is "eighty-one million, six hundred thirty-six thousand, fifty-four".