1257188028 has 12 divisors (see below), whose sum is σ = 2933438760. Its totient is φ = 419062672.

The previous prime is 1257188017. The next prime is 1257188041. The reversal of 1257188028 is 8208817521.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52382823 + ... + 52382846.

It is an arithmetic number, because the mean of its divisors is an integer number (244453230).

Almost surely, 2^1257188028 is an apocalyptic number.

It is an amenable number.

1257188028 is an abundant number, since it is smaller than the sum of its proper divisors (1676250732).

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

1257188028 is a wasteful number, since it uses less digits than its factorization.

1257188028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104765676 (or 104765674 counting only the distinct ones).

The product of its (nonzero) digits is 71680, while the sum is 42.

The square root of 1257188028 is about 35456.8474063896. The cubic root of 1257188028 is about 1079.2782180029.

The spelling of 1257188028 in words is "one billion, two hundred fifty-seven million, one hundred eighty-eight thousand, twenty-eight".