81753832 has 8 divisors (see below), whose sum is σ = 153288450. Its totient is φ = 40876912.

The previous prime is 81753811. The next prime is 81753853. The reversal of 81753832 is 23835718.

It is an interprime number because it is at equal distance from previous prime (81753811) and next prime (81753853).

It can be written as a sum of positive squares in only one way, i.e., 81468676 + 285156 = 9026^2 + 534^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 81753791 and 81753800.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5109607 + ... + 5109622.

Almost surely, 2^81753832 is an apocalyptic number.

It is an amenable number.

81753832 is a deficient number, since it is larger than the sum of its proper divisors (71534618).

81753832 is a wasteful number, since it uses less digits than its factorization.

81753832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10219235 (or 10219231 counting only the distinct ones).

The product of its digits is 40320, while the sum is 37.

The square root of 81753832 is about 9041.7825676135. The cubic root of 81753832 is about 434.0129679632.

The spelling of 81753832 in words is "eighty-one million, seven hundred fifty-three thousand, eight hundred thirty-two".