81964662 has 24 divisors (see below), whose sum is σ = 177511464. Its totient is φ = 25219584.

The previous prime is 81964607. The next prime is 81964669. The reversal of 81964662 is 26646918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81964669) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39403 + ... + 41430.

It is an arithmetic number, because the mean of its divisors is an integer number (7396311).

Almost surely, 2^81964662 is an apocalyptic number.

81964662 is an abundant number, since it is smaller than the sum of its proper divisors (95546802).

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

81964662 is a wasteful number, since it uses less digits than its factorization.

81964662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80864 (or 80851 counting only the distinct ones).

The product of its digits is 124416, while the sum is 42.

The square root of 81964662 is about 9053.4337132383. The cubic root of 81964662 is about 434.3857309565.

The spelling of 81964662 in words is "eighty-one million, nine hundred sixty-four thousand, six hundred sixty-two".