1278483840 has 192 divisors, whose sum is σ = 4443744240. Its totient is φ = 338694144.

The previous prime is 1278483823. The next prime is 1278483851. The reversal of 1278483840 is 483848721.

1278483840 is a `hidden beast` number, since 127 + 8 + 483 + 8 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

It is a super-2 number, since 2×1278483840² = 3269041858282291200, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 995839 + ... + 997121.

Almost surely, 2^1278483840 is an apocalyptic number.

1278483840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1278483840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2221872120).

1278483840 is an abundant number, since it is smaller than the sum of its proper divisors (3165260400).

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

1278483840 is a wasteful number, since it uses less digits than its factorization.

1278483840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1481 (or 1466 counting only the distinct ones).

The product of its (nonzero) digits is 344064, while the sum is 45.

The square root of 1278483840 is about 35755.8923815362. The cubic root of 1278483840 is about 1085.3381802404.

The spelling of 1278483840 in words is "one billion, two hundred seventy-eight million, four hundred eighty-three thousand, eight hundred forty".