1378078065 has 48 divisors (see below), whose sum is σ = 2939908608. Its totient is φ = 581516928.

The previous prime is 1378078049. The next prime is 1378078073. The reversal of 1378078065 is 5608708731.

It is not a de Polignac number, because 1378078065 - 2⁴ = 1378078049 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1378078065.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 164169 + ... + 172358.

It is an arithmetic number, because the mean of its divisors is an integer number (61248096).

Almost surely, 2^1378078065 is an apocalyptic number.

1378078065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1378078065 is an abundant number, since it is smaller than the sum of its proper divisors (1561830543).

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

1378078065 is a wasteful number, since it uses less digits than its factorization.

1378078065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336558 (or 336555 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 45.

The square root of 1378078065 is about 37122.4738534489. The cubic root of 1378078065 is about 1112.8191911615.

The spelling of 1378078065 in words is "one billion, three hundred seventy-eight million, seventy-eight thousand, sixty-five".