1267297644 has 24 divisors (see below), whose sum is σ = 3112661440. Its totient is φ = 400199184.

The previous prime is 1267297579. The next prime is 1267297687. The reversal of 1267297644 is 4467927621.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1267297593 and 1267297602.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2778934 + ... + 2779389.

Almost surely, 2^1267297644 is an apocalyptic number.

It is an amenable number.

1267297644 is an abundant number, since it is smaller than the sum of its proper divisors (1845363796).

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

1267297644 is a wasteful number, since it uses less digits than its factorization.

1267297644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5558349 (or 5558347 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 48.

The square root of 1267297644 is about 35599.1242027104. The cubic root of 1267297644 is about 1082.1634855121.

The spelling of 1267297644 in words is "one billion, two hundred sixty-seven million, two hundred ninety-seven thousand, six hundred forty-four".