78478278 has 8 divisors (see below), whose sum is σ = 156956568. Its totient is φ = 26159424.

The previous prime is 78478261. The next prime is 78478289. The reversal of 78478278 is 87287487.

It is a sphenic number, since it is the product of 3 distinct primes.

78478278 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 78478278.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6539851 + ... + 6539862.

It is an arithmetic number, because the mean of its divisors is an integer number (19619571).

Almost surely, 2^78478278 is an apocalyptic number.

78478278 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78478278 is a wasteful number, since it uses less digits than its factorization.

78478278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13079718.

The product of its digits is 1404928, while the sum is 51.

The square root of 78478278 is about 8858.7966451432. The cubic root of 78478278 is about 428.1373878384.

The spelling of 78478278 in words is "seventy-eight million, four hundred seventy-eight thousand, two hundred seventy-eight".