71672261 has 4 divisors (see below), whose sum is σ = 71753952. Its totient is φ = 71590572.

The previous prime is 71672257. The next prime is 71672281. The reversal of 71672261 is 16227617.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 71672261 - 2² = 71672257 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 (71672231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39515 + ... + 41288.

It is an arithmetic number, because the mean of its divisors is an integer number (17938488).

Almost surely, 2^71672261 is an apocalyptic number.

It is an amenable number.

71672261 is a deficient number, since it is larger than the sum of its proper divisors (81691).

71672261 is an equidigital number, since it uses as much as digits as its factorization.

71672261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81690.

The product of its digits is 7056, while the sum is 32.

The square root of 71672261 is about 8465.9471413422. The cubic root of 71672261 is about 415.3845779404.

Adding to 71672261 its reverse (16227617), we get a palindrome (87899878).

The spelling of 71672261 in words is "seventy-one million, six hundred seventy-two thousand, two hundred sixty-one".