1278959616 has 336 divisors, whose sum is σ = 4293656640. Its totient is φ = 362741760.

The previous prime is 1278959609. The next prime is 1278959659. The reversal of 1278959616 is 6169598721.

1278959616 is a `hidden beast` number, since 12 + 7 + 8 + 9 + 5 + 9 + 616 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15409111 + ... + 15409193.

It is an arithmetic number, because the mean of its divisors is an integer number (12778740).

Almost surely, 2^1278959616 is an apocalyptic number.

1278959616 is a gapful number since it is divisible by the number (16) 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 1278959616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2146828320).

1278959616 is an abundant number, since it is smaller than the sum of its proper divisors (3014697024).

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

1278959616 is a wasteful number, since it uses less digits than its factorization.

1278959616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145 (or 118 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 54.

The square root of 1278959616 is about 35762.5448758894. The cubic root of 1278959616 is about 1085.4727964162.

The spelling of 1278959616 in words is "one billion, two hundred seventy-eight million, nine hundred fifty-nine thousand, six hundred sixteen".