71642887 has 2 divisors, whose sum is σ = 71642888. Its totient is φ = 71642886.

The previous prime is 71642843. The next prime is 71642897. The reversal of 71642887 is 78824617.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71642887 - 2⁷ = 71642759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71642807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35821443 + 35821444.

It is an arithmetic number, because the mean of its divisors is an integer number (35821444).

Almost surely, 2^71642887 is an apocalyptic number.

71642887 is a deficient number, since it is larger than the sum of its proper divisors (1).

71642887 is an equidigital number, since it uses as much as digits as its factorization.

71642887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 150528, while the sum is 43.

The square root of 71642887 is about 8464.2121310846. The cubic root of 71642887 is about 415.3278234226.

The spelling of 71642887 in words is "seventy-one million, six hundred forty-two thousand, eight hundred eighty-seven".