1378678512 has 80 divisors (see below), whose sum is σ = 3935105280. Its totient is φ = 413715456.

The previous prime is 1378678481. The next prime is 1378678517. The reversal of 1378678512 is 2158768731.

It is a happy number.

It is a super-4 number, since 4×1378678512⁴ (a number of 38 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1378678517) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17962 + ... + 55497.

It is an arithmetic number, because the mean of its divisors is an integer number (49188816).

Almost surely, 2^1378678512 is an apocalyptic number.

1378678512 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1378678512 is an abundant number, since it is smaller than the sum of its proper divisors (2556426768).

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

1378678512 is a wasteful number, since it uses less digits than its factorization.

1378678512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73510 (or 73504 counting only the distinct ones).

The product of its digits is 564480, while the sum is 48.

The square root of 1378678512 is about 37130.5603512794. The cubic root of 1378678512 is about 1112.9807910832.

The spelling of 1378678512 in words is "one billion, three hundred seventy-eight million, six hundred seventy-eight thousand, five hundred twelve".