78159049 has 6 divisors (see below), whose sum is σ = 78869726. Its totient is φ = 77454720.

The previous prime is 78159019. The next prime is 78159061. The reversal of 78159049 is 94095187.

It can be written as a sum of positive squares in 3 ways, for example, as 16646400 + 61512649 = 4080^2 + 7843^2 .

It is a de Polignac number, because none of the positive numbers 2^k-78159049 is a prime.

It is a super-2 number, since 2×78159049² = 12217673881168802, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78158996 and 78159014.

It is not an unprimeable number, because it can be changed into a prime (78159019) 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, 9709 + ... + 15829.

Almost surely, 2^78159049 is an apocalyptic number.

It is an amenable number.

78159049 is a deficient number, since it is larger than the sum of its proper divisors (710677).

78159049 is an equidigital number, since it uses as much as digits as its factorization.

78159049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6347 (or 6234 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 78159049 is about 8840.7606573190. The cubic root of 78159049 is about 427.5560821515.

The spelling of 78159049 in words is "seventy-eight million, one hundred fifty-nine thousand, forty-nine".