78648278 has 4 divisors (see below), whose sum is σ = 117972420. Its totient is φ = 39324138.

The previous prime is 78648263. The next prime is 78648313. The reversal of 78648278 is 87284687.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19662068 + ... + 19662071.

It is an arithmetic number, because the mean of its divisors is an integer number (29493105).

Almost surely, 2^78648278 is an apocalyptic number.

78648278 is a deficient number, since it is larger than the sum of its proper divisors (39324142).

78648278 is a wasteful number, since it uses less digits than its factorization.

78648278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39324141.

The product of its digits is 1204224, while the sum is 50.

The square root of 78648278 is about 8868.3864372275. The cubic root of 78648278 is about 428.4463092640.

The spelling of 78648278 in words is "seventy-eight million, six hundred forty-eight thousand, two hundred seventy-eight".