1378321078 has 4 divisors (see below), whose sum is σ = 2067481620. Its totient is φ = 689160538.

The previous prime is 1378321057. The next prime is 1378321093. The reversal of 1378321078 is 8701238731.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1378321078.

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, 344580268 + ... + 344580271.

It is an arithmetic number, because the mean of its divisors is an integer number (516870405).

Almost surely, 2^1378321078 is an apocalyptic number.

1378321078 is a deficient number, since it is larger than the sum of its proper divisors (689160542).

1378321078 is an equidigital number, since it uses as much as digits as its factorization.

1378321078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689160541.

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 1378321078 is about 37125.7468342389. The cubic root of 1378321078 is about 1112.8845995595.

The spelling of 1378321078 in words is "one billion, three hundred seventy-eight million, three hundred twenty-one thousand, seventy-eight".