78620111 has 2 divisors, whose sum is σ = 78620112. Its totient is φ = 78620110.

The previous prime is 78620099. The next prime is 78620159. The reversal of 78620111 is 11102687.

It is a weak prime.

It is an emirp because it is prime and its reverse (11102687) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78620111 is a prime.

It is a super-2 number, since 2×78620111² = 12362243707304642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78620161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39310055 + 39310056.

It is an arithmetic number, because the mean of its divisors is an integer number (39310056).

Almost surely, 2^78620111 is an apocalyptic number.

78620111 is a deficient number, since it is larger than the sum of its proper divisors (1).

78620111 is an equidigital number, since it uses as much as digits as its factorization.

78620111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 78620111 is about 8866.7982383722. The cubic root of 78620111 is about 428.3951554075.

Adding to 78620111 its reverse (11102687), we get a palindrome (89722798).

The spelling of 78620111 in words is "seventy-eight million, six hundred twenty thousand, one hundred eleven".