78278248 has 8 divisors (see below), whose sum is σ = 146771730. Its totient is φ = 39139120.

The previous prime is 78278237. The next prime is 78278287. The reversal of 78278248 is 84287287.

It can be written as a sum of positive squares in only one way, i.e., 65901924 + 12376324 = 8118^2 + 3518^2 .

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

It is a super-2 number, since 2×78278248² = 12254968219899008, which contains 22 as substring.

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 = 78278198 and 78278207.

It is an unprimeable number.

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, 4892383 + ... + 4892398.

Almost surely, 2^78278248 is an apocalyptic number.

It is an amenable number.

78278248 is a deficient number, since it is larger than the sum of its proper divisors (68493482).

78278248 is a wasteful number, since it uses less digits than its factorization.

78278248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9784787 (or 9784783 counting only the distinct ones).

The product of its digits is 401408, while the sum is 46.

The square root of 78278248 is about 8847.4995337666. The cubic root of 78278248 is about 427.7733245215.

The spelling of 78278248 in words is "seventy-eight million, two hundred seventy-eight thousand, two hundred forty-eight".