81753876 has 18 divisors (see below), whose sum is σ = 206655722. Its totient is φ = 27251280.

The previous prime is 81753863. The next prime is 81753911. The reversal of 81753876 is 67835718.

It can be written as a sum of positive squares in only one way, i.e., 59907600 + 21846276 = 7740^2 + 4674^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1135435 + ... + 1135506.

Almost surely, 2^81753876 is an apocalyptic number.

It is an amenable number.

81753876 is an abundant number, since it is smaller than the sum of its proper divisors (124901846).

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

81753876 is a wasteful number, since it uses less digits than its factorization.

81753876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2270951 (or 2270946 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 81753876 is about 9041.7850007617. The cubic root of 81753876 is about 434.0130458253.

The spelling of 81753876 in words is "eighty-one million, seven hundred fifty-three thousand, eight hundred seventy-six".