1277640652 has 6 divisors (see below), whose sum is σ = 2235871148. Its totient is φ = 638820324.

The previous prime is 1277640619. The next prime is 1277640653. The reversal of 1277640652 is 2560467721.

It is not an unprimeable number, because it can be changed into a prime (1277640653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159705078 + ... + 159705085.

Almost surely, 2^1277640652 is an apocalyptic number.

It is an amenable number.

1277640652 is a deficient number, since it is larger than the sum of its proper divisors (958230496).

1277640652 is a wasteful number, since it uses less digits than its factorization.

1277640652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319410167 (or 319410165 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 40.

The square root of 1277640652 is about 35744.0995410431. The cubic root of 1277640652 is about 1085.0995263598.

The spelling of 1277640652 in words is "one billion, two hundred seventy-seven million, six hundred forty thousand, six hundred fifty-two".