81730465 has 8 divisors (see below), whose sum is σ = 98142120. Its totient is φ = 65340672.

The previous prime is 81730433. The next prime is 81730483. The reversal of 81730465 is 56403718.

It can be written as a sum of positive squares in 4 ways, for example, as 5202961 + 76527504 = 2281^2 + 8748^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 81730465 - 2⁵ = 81730433 is a prime.

It is a super-3 number, since 3×81730465³ (a number of 25 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81730465.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4377 + ... + 13513.

It is an arithmetic number, because the mean of its divisors is an integer number (12267765).

Almost surely, 2^81730465 is an apocalyptic number.

It is an amenable number.

81730465 is a deficient number, since it is larger than the sum of its proper divisors (16411655).

81730465 is a wasteful number, since it uses less digits than its factorization.

81730465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10931.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 81730465 is about 9040.4903074999. The cubic root of 81730465 is about 433.9716139490.

The spelling of 81730465 in words is "eighty-one million, seven hundred thirty thousand, four hundred sixty-five".