1278101660 has 48 divisors (see below), whose sum is σ = 2977672320. Its totient is φ = 456882240.

The previous prime is 1278101641. The next prime is 1278101681. The reversal of 1278101660 is 661018721.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36254 + ... + 62213.

It is an arithmetic number, because the mean of its divisors is an integer number (62034840).

Almost surely, 2^1278101660 is an apocalyptic number.

1278101660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1278101660 is an abundant number, since it is smaller than the sum of its proper divisors (1699570660).

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

1278101660 is a wasteful number, since it uses less digits than its factorization.

1278101660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98546 (or 98544 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 1278101660 is about 35750.5476881124. The cubic root of 1278101660 is about 1085.2300219486.

The spelling of 1278101660 in words is "one billion, two hundred seventy-eight million, one hundred one thousand, six hundred sixty".