78946849 has 4 divisors (see below), whose sum is σ = 78967620. Its totient is φ = 78926080.

The previous prime is 78946823. The next prime is 78946859. The reversal of 78946849 is 94864987.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94864987 = 7 ⋅13552141.

It can be written as a sum of positive squares in 2 ways, for example, as 43758225 + 35188624 = 6615^2 + 5932^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78946849 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78946849.

It is not an unprimeable number, because it can be changed into a prime (78946859) 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, 2872 + ... + 12889.

It is an arithmetic number, because the mean of its divisors is an integer number (19741905).

Almost surely, 2^78946849 is an apocalyptic number.

It is an amenable number.

78946849 is a deficient number, since it is larger than the sum of its proper divisors (20771).

78946849 is a wasteful number, since it uses less digits than its factorization.

78946849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20770.

The product of its digits is 3483648, while the sum is 55.

The square root of 78946849 is about 8885.2039368829. The cubic root of 78946849 is about 428.9877922278.

The spelling of 78946849 in words is "seventy-eight million, nine hundred forty-six thousand, eight hundred forty-nine".