71640847 has 2 divisors, whose sum is σ = 71640848. Its totient is φ = 71640846.

The previous prime is 71640797. The next prime is 71640859. The reversal of 71640847 is 74804617.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71640847 - 2⁷ = 71640719 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71640347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35820423 + 35820424.

It is an arithmetic number, because the mean of its divisors is an integer number (35820424).

Almost surely, 2^71640847 is an apocalyptic number.

71640847 is a deficient number, since it is larger than the sum of its proper divisors (1).

71640847 is an equidigital number, since it uses as much as digits as its factorization.

71640847 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37632, while the sum is 37.

The square root of 71640847 is about 8464.0916228500. The cubic root of 71640847 is about 415.3238812922.

The spelling of 71640847 in words is "seventy-one million, six hundred forty thousand, eight hundred forty-seven".