78534826 has 4 divisors (see below), whose sum is σ = 117802242. Its totient is φ = 39267412.

The previous prime is 78534823. The next prime is 78534829. The reversal of 78534826 is 62843587.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 62843587 = 263 ⋅238949.

It is an interprime number because it is at equal distance from previous prime (78534823) and next prime (78534829).

It can be written as a sum of positive squares in only one way, i.e., 73017025 + 5517801 = 8545^2 + 2349^2 .

It is not an unprimeable number, because it can be changed into a prime (78534823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19633705 + ... + 19633708.

Almost surely, 2^78534826 is an apocalyptic number.

78534826 is a deficient number, since it is larger than the sum of its proper divisors (39267416).

78534826 is a wasteful number, since it uses less digits than its factorization.

78534826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39267415.

The product of its digits is 322560, while the sum is 43.

The square root of 78534826 is about 8861.9877002849. The cubic root of 78534826 is about 428.2401954814.

The spelling of 78534826 in words is "seventy-eight million, five hundred thirty-four thousand, eight hundred twenty-six".