78903978 has 8 divisors (see below), whose sum is σ = 157807968. Its totient is φ = 26301324.

The previous prime is 78903977. The next prime is 78903989. The reversal of 78903978 is 87930987.

It is a happy number.

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

78903978 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 78903978.

It is not an unprimeable number, because it can be changed into a prime (78903977) 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, 6575326 + ... + 6575337.

It is an arithmetic number, because the mean of its divisors is an integer number (19725996).

Almost surely, 2^78903978 is an apocalyptic number.

78903978 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.

78903978 is a wasteful number, since it uses less digits than its factorization.

78903978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13150668.

The product of its (nonzero) digits is 762048, while the sum is 51.

The square root of 78903978 is about 8882.7911154096. The cubic root of 78903978 is about 428.9101261951.

The spelling of 78903978 in words is "seventy-eight million, nine hundred three thousand, nine hundred seventy-eight".