1257265428 has 24 divisors (see below), whose sum is σ = 2934923040. Its totient is φ = 418902240.

The previous prime is 1257265423. The next prime is 1257265547. The reversal of 1257265428 is 8245627521.

It is a self number, because there is not a number n which added to its sum of digits gives 1257265428.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257265421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6358 + ... + 50546.

It is an arithmetic number, because the mean of its divisors is an integer number (122288460).

Almost surely, 2^1257265428 is an apocalyptic number.

It is an amenable number.

1257265428 is an abundant number, since it is smaller than the sum of its proper divisors (1677657612).

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

1257265428 is a wasteful number, since it uses less digits than its factorization.

1257265428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46567 (or 46565 counting only the distinct ones).

The product of its digits is 268800, while the sum is 42.

The square root of 1257265428 is about 35457.9388571868. The cubic root of 1257265428 is about 1079.3003664850.

The spelling of 1257265428 in words is "one billion, two hundred fifty-seven million, two hundred sixty-five thousand, four hundred twenty-eight".