78634049 has 4 divisors (see below), whose sum is σ = 84682836. Its totient is φ = 72585264.

The previous prime is 78634007. The next prime is 78634091. The reversal of 78634049 is 94043687.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (78634007) and next prime (78634091).

It can be written as a sum of positive squares in 2 ways, for example, as 6723649 + 71910400 = 2593^2 + 8480^2 .

It is a cyclic number.

It is not a de Polignac number, because 78634049 - 2¹² = 78629953 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78633997 and 78634015.

It is not an unprimeable number, because it can be changed into a prime (78634649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3024374 + ... + 3024399.

It is an arithmetic number, because the mean of its divisors is an integer number (21170709).

Almost surely, 2^78634049 is an apocalyptic number.

It is an amenable number.

78634049 is a deficient number, since it is larger than the sum of its proper divisors (6048787).

78634049 is a wasteful number, since it uses less digits than its factorization.

78634049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6048786.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 78634049 is about 8867.5841693214. The cubic root of 78634049 is about 428.4204696212.

The spelling of 78634049 in words is "seventy-eight million, six hundred thirty-four thousand, forty-nine".