81252006 has 16 divisors (see below), whose sum is σ = 177277248. Its totient is φ = 24621800.

The previous prime is 81252001. The next prime is 81252011. The reversal of 81252006 is 60025218.

It is an interprime number because it is at equal distance from previous prime (81252001) and next prime (81252011).

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81252001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 615480 + ... + 615611.

It is an arithmetic number, because the mean of its divisors is an integer number (11079828).

Almost surely, 2^81252006 is an apocalyptic number.

81252006 is an abundant number, since it is smaller than the sum of its proper divisors (96025242).

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

81252006 is a wasteful number, since it uses less digits than its factorization.

81252006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1231107.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 81252006 is about 9013.9894608325. The cubic root of 81252006 is about 433.1231171040.

The spelling of 81252006 in words is "eighty-one million, two hundred fifty-two thousand, six".