78106869 has 8 divisors (see below), whose sum is σ = 115713920. Its totient is φ = 52071228.

The previous prime is 78106859. The next prime is 78106879. The reversal of 78106869 is 96860187.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (78106859) and next prime (78106879).

It is not a de Polignac number, because 78106869 - 2⁵ = 78106837 is a prime.

It is a super-2 number, since 2×78106869² = 12201365969966322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78106849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1446397 + ... + 1446450.

It is an arithmetic number, because the mean of its divisors is an integer number (14464240).

Almost surely, 2^78106869 is an apocalyptic number.

It is an amenable number.

78106869 is a deficient number, since it is larger than the sum of its proper divisors (37607051).

78106869 is a wasteful number, since it uses less digits than its factorization.

78106869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2892856 (or 2892850 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 78106869 is about 8837.8090610739. The cubic root of 78106869 is about 427.4609136317.

The spelling of 78106869 in words is "seventy-eight million, one hundred six thousand, eight hundred sixty-nine".