81277332 has 12 divisors (see below), whose sum is σ = 189647136. Its totient is φ = 27092440.

The previous prime is 81277297. The next prime is 81277337. The reversal of 81277332 is 23377218.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 81277293 and 81277302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81277337) 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 3 ways as a sum of consecutive naturals, for example, 3386544 + ... + 3386567.

It is an arithmetic number, because the mean of its divisors is an integer number (15803928).

Almost surely, 2^81277332 is an apocalyptic number.

It is an amenable number.

81277332 is an abundant number, since it is smaller than the sum of its proper divisors (108369804).

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

81277332 is a wasteful number, since it uses less digits than its factorization.

81277332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6773118 (or 6773116 counting only the distinct ones).

The product of its digits is 14112, while the sum is 33.

The square root of 81277332 is about 9015.3941677555. The cubic root of 81277332 is about 433.1681134764.

The spelling of 81277332 in words is "eighty-one million, two hundred seventy-seven thousand, three hundred thirty-two".