81262608 has 80 divisors (see below), whose sum is σ = 240936960. Its totient is φ = 23119488.

The previous prime is 81262603. The next prime is 81262631. The reversal of 81262608 is 80626218.

It is a super-2 number, since 2×81262608² = 13207222917923328, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81262603) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 122983 + ... + 123641.

It is an arithmetic number, because the mean of its divisors is an integer number (3011712).

Almost surely, 2^81262608 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81262608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120468480).

81262608 is an abundant number, since it is smaller than the sum of its proper divisors (159674352).

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

81262608 is a wasteful number, since it uses less digits than its factorization.

81262608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1044 (or 1038 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 81262608 is about 9014.5775275384. The cubic root of 81262608 is about 433.1419546761.

The spelling of 81262608 in words is "eighty-one million, two hundred sixty-two thousand, six hundred eight".