78040871 has 2 divisors, whose sum is σ = 78040872. Its totient is φ = 78040870.

The previous prime is 78040801. The next prime is 78040883. The reversal of 78040871 is 17804087.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78040871 - 2²² = 73846567 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78040801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39020435 + 39020436.

It is an arithmetic number, because the mean of its divisors is an integer number (39020436).

Almost surely, 2^78040871 is an apocalyptic number.

78040871 is a deficient number, since it is larger than the sum of its proper divisors (1).

78040871 is an equidigital number, since it uses as much as digits as its factorization.

78040871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12544, while the sum is 35.

The square root of 78040871 is about 8834.0744280315. The cubic root of 78040871 is about 427.3404824181.

The spelling of 78040871 in words is "seventy-eight million, forty thousand, eight hundred seventy-one".