78159069 has 6 divisors (see below), whose sum is σ = 112896446. Its totient is φ = 52106040.

The previous prime is 78159061. The next prime is 78159101. The reversal of 78159069 is 96095187.

It can be written as a sum of positive squares in only one way, i.e., 76790169 + 1368900 = 8763^2 + 1170^2 .

It is not a de Polignac number, because 78159069 - 2³ = 78159061 is a prime.

It is a super-2 number, since 2×78159069² = 12217680133893522, 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 (78159061) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4342162 + ... + 4342179.

Almost surely, 2^78159069 is an apocalyptic number.

It is an amenable number.

78159069 is a deficient number, since it is larger than the sum of its proper divisors (34737377).

78159069 is a wasteful number, since it uses less digits than its factorization.

78159069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8684347 (or 8684344 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 78159069 is about 8840.7617884433. The cubic root of 78159069 is about 427.5561186204.

The spelling of 78159069 in words is "seventy-eight million, one hundred fifty-nine thousand, sixty-nine".