1628239887 has 40 divisors (see below), whose sum is σ = 2541464640. Its totient is φ = 1037534400.

The previous prime is 1628239861. The next prime is 1628239909. The reversal of 1628239887 is 7889328261.

It is a happy number.

1628239887 is a `hidden beast` number, since 1 + 628 + 2 + 3 + 9 + 8 + 8 + 7 = 666.

It is not a de Polignac number, because 1628239887 - 2¹⁹ = 1627715599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1628239807) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 233818 + ... + 240680.

It is an arithmetic number, because the mean of its divisors is an integer number (63536616).

Almost surely, 2^1628239887 is an apocalyptic number.

1628239887 is a deficient number, since it is larger than the sum of its proper divisors (913224753).

1628239887 is a wasteful number, since it uses less digits than its factorization.

1628239887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7005 (or 6996 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 54.

The square root of 1628239887 is about 40351.4545834472. The cubic root of 1628239887 is about 1176.4481645153.

It can be divided in two parts, 16282 and 39887, that added together give a square (56169 = 237²).

The spelling of 1628239887 in words is "one billion, six hundred twenty-eight million, two hundred thirty-nine thousand, eight hundred eighty-seven".