81672603 has 8 divisors (see below), whose sum is σ = 109060368. Its totient is φ = 54366624.

The previous prime is 81672601. The next prime is 81672611. The reversal of 81672603 is 30627618.

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

It is not a de Polignac number, because 81672603 - 2¹ = 81672601 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (81672601) 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, 18076 + ... + 22137.

It is an arithmetic number, because the mean of its divisors is an integer number (13632546).

Almost surely, 2^81672603 is an apocalyptic number.

81672603 is a deficient number, since it is larger than the sum of its proper divisors (27387765).

81672603 is a wasteful number, since it uses less digits than its factorization.

81672603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40893.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 81672603 is about 9037.2895826127. The cubic root of 81672603 is about 433.8691780800.

The spelling of 81672603 in words is "eighty-one million, six hundred seventy-two thousand, six hundred three".