81672597 has 16 divisors (see below), whose sum is σ = 121152960. Its totient is φ = 54378000.

The previous prime is 81672587. The next prime is 81672599. The reversal of 81672597 is 79527618.

It is not a de Polignac number, because 81672597 - 2¹⁰ = 81671573 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81672599) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27222 + ... + 30072.

It is an arithmetic number, because the mean of its divisors is an integer number (7572060).

Almost surely, 2^81672597 is an apocalyptic number.

It is an amenable number.

81672597 is a deficient number, since it is larger than the sum of its proper divisors (39480363).

81672597 is a wasteful number, since it uses less digits than its factorization.

81672597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3921 (or 3915 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 81672597 is about 9037.2892506548. The cubic root of 81672597 is about 433.8691674554.

The spelling of 81672597 in words is "eighty-one million, six hundred seventy-two thousand, five hundred ninety-seven".