81760537 has 4 divisors (see below), whose sum is σ = 81781776. Its totient is φ = 81739300.

The previous prime is 81760529. The next prime is 81760559. The reversal of 81760537 is 73506718.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 73506718 = 2 ⋅36753359.

It is a cyclic number.

It is not a de Polignac number, because 81760537 - 2³ = 81760529 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81760496 and 81760505.

It is not an unprimeable number, because it can be changed into a prime (81760517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3043 + ... + 13144.

It is an arithmetic number, because the mean of its divisors is an integer number (20445444).

Almost surely, 2^81760537 is an apocalyptic number.

It is an amenable number.

81760537 is a deficient number, since it is larger than the sum of its proper divisors (21239).

81760537 is a wasteful number, since it uses less digits than its factorization.

81760537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21238.

The product of its (nonzero) digits is 35280, while the sum is 37.

The square root of 81760537 is about 9042.1533386688. The cubic root of 81760537 is about 434.0248327583.

The spelling of 81760537 in words is "eighty-one million, seven hundred sixty thousand, five hundred thirty-seven".