81695964 has 48 divisors (see below), whose sum is σ = 222501888. Its totient is φ = 22843968.

The previous prime is 81695951. The next prime is 81695969. The reversal of 81695964 is 46959618.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81695969) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6399 + ... + 14294.

It is an arithmetic number, because the mean of its divisors is an integer number (4635456).

Almost surely, 2^81695964 is an apocalyptic number.

81695964 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

81695964 is an abundant number, since it is smaller than the sum of its proper divisors (140805924).

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

81695964 is a wasteful number, since it uses less digits than its factorization.

81695964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20754 (or 20752 counting only the distinct ones).

The product of its digits is 466560, while the sum is 48.

The square root of 81695964 is about 9038.5819684285. The cubic root of 81695964 is about 433.9105409985.

The spelling of 81695964 in words is "eighty-one million, six hundred ninety-five thousand, nine hundred sixty-four".