1278634564 has 27 divisors (see below), whose sum is σ = 2364090141. Its totient is φ = 605025360.

The previous prime is 1278634559. The next prime is 1278634579. The reversal of 1278634564 is 4654368721.

The square root of 1278634564 is 35758.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 792872964 + 485761600 = 28158^2 + 22040^2 .

It is a Duffinian 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 8 ways as a sum of consecutive naturals, for example, 1358334 + ... + 1359274.

Almost surely, 2^1278634564 is an apocalyptic number.

1278634564 is the 35758-th square number.

It is an amenable number.

1278634564 is a deficient number, since it is larger than the sum of its proper divisors (1085455577).

1278634564 is an frugal number, since it uses more digits than its factorization.

1278634564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1924 (or 962 counting only the distinct ones).

The product of its digits is 967680, while the sum is 46.

The cubic root of 1278634564 is about 1085.3808297388.

The spelling of 1278634564 in words is "one billion, two hundred seventy-eight million, six hundred thirty-four thousand, five hundred sixty-four".