81412650 has 72 divisors (see below), whose sum is σ = 238627584. Its totient is φ = 19735200.

The previous prime is 81412649. The next prime is 81412651. The reversal of 81412650 is 5621418.

81412650 is a `hidden beast` number, since 8 + 1 + 4 + 1 + 2 + 650 = 666.

It is an interprime number because it is at equal distance from previous prime (81412649) and next prime (81412651).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81412651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3274 + ... + 13173.

It is an arithmetic number, because the mean of its divisors is an integer number (3314272).

Almost surely, 2^81412650 is an apocalyptic number.

81412650 is an abundant number, since it is smaller than the sum of its proper divisors (157214934).

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

81412650 is a wasteful number, since it uses less digits than its factorization.

81412650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16476 (or 16468 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 81412650 is about 9022.8958766019. The cubic root of 81412650 is about 433.4083729351.

The spelling of 81412650 in words is "eighty-one million, four hundred twelve thousand, six hundred fifty".