71679557 has 2 divisors, whose sum is σ = 71679558. Its totient is φ = 71679556.

The previous prime is 71679539. The next prime is 71679577. The reversal of 71679557 is 75597617.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70543201 + 1136356 = 8399^2 + 1066^2 .

It is a cyclic number.

It is not a de Polignac number, because 71679557 - 2⁶ = 71679493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71679527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35839778 + 35839779.

It is an arithmetic number, because the mean of its divisors is an integer number (35839779).

Almost surely, 2^71679557 is an apocalyptic number.

It is an amenable number.

71679557 is a deficient number, since it is larger than the sum of its proper divisors (1).

71679557 is an equidigital number, since it uses as much as digits as its factorization.

71679557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 463050, while the sum is 47.

The square root of 71679557 is about 8466.3780331379. The cubic root of 71679557 is about 415.3986723893.

The spelling of 71679557 in words is "seventy-one million, six hundred seventy-nine thousand, five hundred fifty-seven".