81962804 has 48 divisors (see below), whose sum is σ = 182238336. Its totient is φ = 31324800.

The previous prime is 81962801. The next prime is 81962809. The reversal of 81962804 is 40826918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81962801) 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, 13814 + ... + 18834.

It is an arithmetic number, because the mean of its divisors is an integer number (3796632).

Almost surely, 2^81962804 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 81962804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91119168).

81962804 is an abundant number, since it is smaller than the sum of its proper divisors (100275532).

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

81962804 is a wasteful number, since it uses less digits than its factorization.

81962804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5096 (or 5094 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 81962804 is about 9053.3310996561. The cubic root of 81962804 is about 434.3824486689.

The spelling of 81962804 in words is "eighty-one million, nine hundred sixty-two thousand, eight hundred four".