81675415 has 8 divisors (see below), whose sum is σ = 102271968. Its totient is φ = 62499360.

The previous prime is 81675413. The next prime is 81675431. The reversal of 81675415 is 51457618.

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

It is not a de Polignac number, because 81675415 - 2¹ = 81675413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81675413) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 354996 + ... + 355225.

It is an arithmetic number, because the mean of its divisors is an integer number (12783996).

Almost surely, 2^81675415 is an apocalyptic number.

81675415 is a deficient number, since it is larger than the sum of its proper divisors (20596553).

81675415 is a wasteful number, since it uses less digits than its factorization.

81675415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710249.

The product of its digits is 33600, while the sum is 37.

The square root of 81675415 is about 9037.4451588931. The cubic root of 81675415 is about 433.8741574166.

The spelling of 81675415 in words is "eighty-one million, six hundred seventy-five thousand, four hundred fifteen".