1628488257 has 16 divisors (see below), whose sum is σ = 2370368448. Its totient is φ = 986271680.

The previous prime is 1628488237. The next prime is 1628488273. The reversal of 1628488257 is 7528848261.

It is a cyclic number.

It is not a de Polignac number, because 1628488257 - 2¹² = 1628484161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1628488207) 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, 32743 + ... + 65795.

It is an arithmetic number, because the mean of its divisors is an integer number (148148028).

Almost surely, 2^1628488257 is an apocalyptic number.

It is an amenable number.

1628488257 is a deficient number, since it is larger than the sum of its proper divisors (741880191).

1628488257 is a wasteful number, since it uses less digits than its factorization.

1628488257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34560.

The product of its digits is 1720320, while the sum is 51.

The square root of 1628488257 is about 40354.5320503162. The cubic root of 1628488257 is about 1176.5079795293.

The spelling of 1628488257 in words is "one billion, six hundred twenty-eight million, four hundred eighty-eight thousand, two hundred fifty-seven".