78115069 has 4 divisors (see below), whose sum is σ = 78144444. Its totient is φ = 78085696.

The previous prime is 78115049. The next prime is 78115073. The reversal of 78115069 is 96051187.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96051187 = 157 ⋅611791.

It can be written as a sum of positive squares in 2 ways, for example, as 13505625 + 64609444 = 3675^2 + 8038^2 .

It is a cyclic number.

It is not a de Polignac number, because 78115069 - 2⁷ = 78114941 is a prime.

It is a super-2 number, since 2×78115069² = 12203928009749522, 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 (78115019) 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 in 3 ways as a sum of consecutive naturals, for example, 10252 + ... + 16165.

It is an arithmetic number, because the mean of its divisors is an integer number (19536111).

Almost surely, 2^78115069 is an apocalyptic number.

It is an amenable number.

78115069 is a deficient number, since it is larger than the sum of its proper divisors (29375).

78115069 is a wasteful number, since it uses less digits than its factorization.

78115069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29374.

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 78115069 is about 8838.2729647822. The cubic root of 78115069 is about 427.4758720124.

It can be divided in two parts, 7811 and 5069, that added together give a triangular number (12880 = T₁₆₀).

The spelling of 78115069 in words is "seventy-eight million, one hundred fifteen thousand, sixty-nine".