78861448 has 8 divisors (see below), whose sum is σ = 147865230. Its totient is φ = 39430720.

The previous prime is 78861443. The next prime is 78861449. The reversal of 78861448 is 84416887.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 49028004 + 29833444 = 7002^2 + 5462^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 78861398 and 78861407.

It is not an unprimeable number, because it can be changed into a prime (78861443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4928833 + ... + 4928848.

Almost surely, 2^78861448 is an apocalyptic number.

It is an amenable number.

78861448 is a deficient number, since it is larger than the sum of its proper divisors (69003782).

78861448 is a wasteful number, since it uses less digits than its factorization.

78861448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9857687 (or 9857683 counting only the distinct ones).

The product of its digits is 344064, while the sum is 46.

The square root of 78861448 is about 8880.3968379797. The cubic root of 78861448 is about 428.8330501230.

The spelling of 78861448 in words is "seventy-eight million, eight hundred sixty-one thousand, four hundred forty-eight".