1278023670 has 320 divisors, whose sum is σ = 4429320192. Its totient is φ = 256608000.

The previous prime is 1278023651. The next prime is 1278023693. The reversal of 1278023670 is 763208721.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 1933140 + ... + 1933800.

Almost surely, 2^1278023670 is an apocalyptic number.

1278023670 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1278023670, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2214660096).

1278023670 is an abundant number, since it is smaller than the sum of its proper divisors (3151296522).

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

1278023670 is a wasteful number, since it uses less digits than its factorization.

1278023670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729 (or 720 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 1278023670 is about 35749.4569189519. The cubic root of 1278023670 is about 1085.2079478540.

The spelling of 1278023670 in words is "one billion, two hundred seventy-eight million, twenty-three thousand, six hundred seventy".