1956628857 has 32 divisors (see below), whose sum is σ = 2724793344. Its totient is φ = 1247832000.

The previous prime is 1956628853. The next prime is 1956628867. The reversal of 1956628857 is 7588266591.

It is not a de Polignac number, because 1956628857 - 2² = 1956628853 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1956628797 and 1956628806.

It is not an unprimeable number, because it can be changed into a prime (1956628853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1792882 + ... + 1793972.

It is an arithmetic number, because the mean of its divisors is an integer number (85149792).

Almost surely, 2^1956628857 is an apocalyptic number.

It is an amenable number.

1956628857 is a deficient number, since it is larger than the sum of its proper divisors (768164487).

1956628857 is a wasteful number, since it uses less digits than its factorization.

1956628857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1389.

The product of its digits is 7257600, while the sum is 57.

The square root of 1956628857 is about 44233.7976777938. The cubic root of 1956628857 is about 1250.7470429459.

The spelling of 1956628857 in words is "one billion, nine hundred fifty-six million, six hundred twenty-eight thousand, eight hundred fifty-seven".