81008252 has 24 divisors (see below), whose sum is σ = 157936800. Its totient is φ = 36098496.

The previous prime is 81008243. The next prime is 81008273. The reversal of 81008252 is 25280018.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25352 + ... + 28367.

It is an arithmetic number, because the mean of its divisors is an integer number (6580700).

Almost surely, 2^81008252 is an apocalyptic number.

It is an amenable number.

81008252 is a deficient number, since it is larger than the sum of its proper divisors (76928548).

81008252 is a wasteful number, since it uses less digits than its factorization.

81008252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53765 (or 53763 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 26.

The square root of 81008252 is about 9000.4584327689. The cubic root of 81008252 is about 432.6895637334.

The spelling of 81008252 in words is "eighty-one million, eight thousand, two hundred fifty-two".