71988577 has 2 divisors, whose sum is σ = 71988578. Its totient is φ = 71988576.

The previous prime is 71988559. The next prime is 71988583. The reversal of 71988577 is 77588917.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71639296 + 349281 = 8464^2 + 591^2 .

It is a cyclic number.

It is not a de Polignac number, because 71988577 - 2¹⁵ = 71955809 is a prime.

It is not a weakly prime, because it can be changed into another prime (71988277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35994288 + 35994289.

It is an arithmetic number, because the mean of its divisors is an integer number (35994289).

Almost surely, 2^71988577 is an apocalyptic number.

It is an amenable number.

71988577 is a deficient number, since it is larger than the sum of its proper divisors (1).

71988577 is an equidigital number, since it uses as much as digits as its factorization.

71988577 is an evil number, because the sum of its binary digits is even.

The product of its digits is 987840, while the sum is 52.

The square root of 71988577 is about 8484.6082408088. The cubic root of 71988577 is about 415.9947627083.

The spelling of 71988577 in words is "seventy-one million, nine hundred eighty-eight thousand, five hundred seventy-seven".