78977071 has 2 divisors, whose sum is σ = 78977072. Its totient is φ = 78977070.

The previous prime is 78977033. The next prime is 78977113. The reversal of 78977071 is 17077987.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78977071 - 2¹¹ = 78975023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78977771) 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, 39488535 + 39488536.

It is an arithmetic number, because the mean of its divisors is an integer number (39488536).

Almost surely, 2^78977071 is an apocalyptic number.

78977071 is a deficient number, since it is larger than the sum of its proper divisors (1).

78977071 is an equidigital number, since it uses as much as digits as its factorization.

78977071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 172872, while the sum is 46.

The square root of 78977071 is about 8886.9044666858. The cubic root of 78977071 is about 429.0425261625.

The spelling of 78977071 in words is "seventy-eight million, nine hundred seventy-seven thousand, seventy-one".