78119861 has 4 divisors (see below), whose sum is σ = 79108800. Its totient is φ = 77130924.

The previous prime is 78119851. The next prime is 78119897. The reversal of 78119861 is 16891187.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16891187 = 31 ⋅544877.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78119861 is a prime.

It is a super-2 number, since 2×78119861² = 12205425365318642, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78119851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 494351 + ... + 494508.

It is an arithmetic number, because the mean of its divisors is an integer number (19777200).

Almost surely, 2^78119861 is an apocalyptic number.

It is an amenable number.

78119861 is a deficient number, since it is larger than the sum of its proper divisors (988939).

78119861 is an equidigital number, since it uses as much as digits as its factorization.

78119861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 988938.

The product of its digits is 24192, while the sum is 41.

The square root of 78119861 is about 8838.5440543112. The cubic root of 78119861 is about 427.4846130595.

The spelling of 78119861 in words is "seventy-eight million, one hundred nineteen thousand, eight hundred sixty-one".