81764049 has 8 divisors (see below), whose sum is σ = 114756640. Its totient is φ = 51640416.

The previous prime is 81764017. The next prime is 81764071. The reversal of 81764049 is 94046718.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81764049 - 2⁵ = 81764017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81763998 and 81764016.

It is not an unprimeable number, because it can be changed into a prime (81764009) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 717172 + ... + 717285.

It is an arithmetic number, because the mean of its divisors is an integer number (14344580).

Almost surely, 2^81764049 is an apocalyptic number.

It is an amenable number.

81764049 is a deficient number, since it is larger than the sum of its proper divisors (32992591).

81764049 is a wasteful number, since it uses less digits than its factorization.

81764049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1434479.

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 81764049 is about 9042.3475381120. The cubic root of 81764049 is about 434.0310471394.

The spelling of 81764049 in words is "eighty-one million, seven hundred sixty-four thousand, forty-nine".