1628862887 has 4 divisors (see below), whose sum is σ = 1634422440. Its totient is φ = 1623303336.

The previous prime is 1628862857. The next prime is 1628862889. The reversal of 1628862887 is 7882688261.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1628862887 - 2¹⁶ = 1628797351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1628862889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2779337 + ... + 2779922.

It is an arithmetic number, because the mean of its divisors is an integer number (408605610).

Almost surely, 2^1628862887 is an apocalyptic number.

1628862887 is a deficient number, since it is larger than the sum of its proper divisors (5559553).

1628862887 is an equidigital number, since it uses as much as digits as its factorization.

1628862887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5559552.

The product of its digits is 4128768, while the sum is 56.

The square root of 1628862887 is about 40359.1735173058. The cubic root of 1628862887 is about 1176.5981902689.

The spelling of 1628862887 in words is "one billion, six hundred twenty-eight million, eight hundred sixty-two thousand, eight hundred eighty-seven".