1213628757 has 16 divisors (see below), whose sum is σ = 1766069760. Its totient is φ = 735202800.

The previous prime is 1213628747. The next prime is 1213628777. The reversal of 1213628757 is 7578263121.

It is not a de Polignac number, because 1213628757 - 2⁶ = 1213628693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213628737) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80832 + ... + 94662.

It is an arithmetic number, because the mean of its divisors is an integer number (110379360).

Almost surely, 2^1213628757 is an apocalyptic number.

It is an amenable number.

1213628757 is a deficient number, since it is larger than the sum of its proper divisors (552441003).

1213628757 is a wasteful number, since it uses less digits than its factorization.

1213628757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16504.

The product of its digits is 141120, while the sum is 42.

The square root of 1213628757 is about 34837.1749285157. The cubic root of 1213628757 is about 1066.6664110134. Note that the first 3 decimals are identical.

The spelling of 1213628757 in words is "one billion, two hundred thirteen million, six hundred twenty-eight thousand, seven hundred fifty-seven".