78044999 has 2 divisors, whose sum is σ = 78045000. Its totient is φ = 78044998.

The previous prime is 78044959. The next prime is 78045001. The reversal of 78044999 is 99944087.

It is a strong prime.

It is an emirp because it is prime and its reverse (99944087) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78044999 - 2¹² = 78040903 is a prime.

Together with 78045001, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78044959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39022499 + 39022500.

It is an arithmetic number, because the mean of its divisors is an integer number (39022500).

Almost surely, 2^78044999 is an apocalyptic number.

78044999 is a deficient number, since it is larger than the sum of its proper divisors (1).

78044999 is an equidigital number, since it uses as much as digits as its factorization.

78044999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 653184, while the sum is 50.

The square root of 78044999 is about 8834.3080657174. The cubic root of 78044999 is about 427.3480170615.

The spelling of 78044999 in words is "seventy-eight million, forty-four thousand, nine hundred ninety-nine".