71726989 has 2 divisors, whose sum is σ = 71726990. Its totient is φ = 71726988.

The previous prime is 71726983. The next prime is 71727017. The reversal of 71726989 is 98962717.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71537764 + 189225 = 8458^2 + 435^2 .

It is a cyclic number.

It is not a de Polignac number, because 71726989 - 2³ = 71726981 is a prime.

It is a super-2 number, since 2×71726989² = 10289521902012242, which contains 22 as substring.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71726981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35863494 + 35863495.

It is an arithmetic number, because the mean of its divisors is an integer number (35863495).

Almost surely, 2^71726989 is an apocalyptic number.

It is an amenable number.

71726989 is a deficient number, since it is larger than the sum of its proper divisors (1).

71726989 is an equidigital number, since it uses as much as digits as its factorization.

71726989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 381024, while the sum is 49.

The square root of 71726989 is about 8469.1787677437. The cubic root of 71726989 is about 415.4902784493.

It can be divided in two parts, 7172 and 6989, that added together give a square (14161 = 119²).

The spelling of 71726989 in words is "seventy-one million, seven hundred twenty-six thousand, nine hundred eighty-nine".