81562268 has 12 divisors (see below), whose sum is σ = 147656040. Its totient is φ = 39374832.

The previous prime is 81562259. The next prime is 81562279. The reversal of 81562268 is 86226518.

It is a super-3 number, since 3×81562268³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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 3 ways as a sum of consecutive naturals, for example, 351446 + ... + 351677.

It is an arithmetic number, because the mean of its divisors is an integer number (12304670).

Almost surely, 2^81562268 is an apocalyptic number.

It is an amenable number.

81562268 is a deficient number, since it is larger than the sum of its proper divisors (66093772).

81562268 is a wasteful number, since it uses less digits than its factorization.

81562268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 703156 (or 703154 counting only the distinct ones).

The product of its digits is 46080, while the sum is 38.

The square root of 81562268 is about 9031.1830897175. The cubic root of 81562268 is about 433.6737125785.

The spelling of 81562268 in words is "eighty-one million, five hundred sixty-two thousand, two hundred sixty-eight".