1267863640 has 16 divisors (see below), whose sum is σ = 2852693280. Its totient is φ = 507145440.

The previous prime is 1267863629. The next prime is 1267863679. The reversal of 1267863640 is 463687621.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15848256 + ... + 15848335.

It is an arithmetic number, because the mean of its divisors is an integer number (178293330).

Almost surely, 2^1267863640 is an apocalyptic number.

1267863640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1267863640 is an abundant number, since it is smaller than the sum of its proper divisors (1584829640).

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

1267863640 is a wasteful number, since it uses less digits than its factorization.

1267863640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31696602 (or 31696598 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 43.

The square root of 1267863640 is about 35607.0728928959. The cubic root of 1267863640 is about 1082.3245655461.

The spelling of 1267863640 in words is "one billion, two hundred sixty-seven million, eight hundred sixty-three thousand, six hundred forty".