1282640978 has 12 divisors (see below), whose sum is σ = 1929030138. Its totient is φ = 639633600.

The previous prime is 1282640963. The next prime is 1282641049. The reversal of 1282640978 is 8790462821.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 1094484889 + 188156089 = 33083^2 + 13717^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1241150 + ... + 1242182.

Almost surely, 2^1282640978 is an apocalyptic number.

1282640978 is a deficient number, since it is larger than the sum of its proper divisors (646389160).

1282640978 is an frugal number, since it uses more digits than its factorization.

1282640978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2669 (or 1636 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 47.

The square root of 1282640978 is about 35813.9774110612. The cubic root of 1282640978 is about 1086.5132750268.

The spelling of 1282640978 in words is "one billion, two hundred eighty-two million, six hundred forty thousand, nine hundred seventy-eight".