1628724863 has 4 divisors (see below), whose sum is σ = 1628950680. Its totient is φ = 1628499048.

The previous prime is 1628724857. The next prime is 1628724901. The reversal of 1628724863 is 3684278261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3684278261 = 139 ⋅26505599.

It is a cyclic number.

It is not a de Polignac number, because 1628724863 - 2⁸ = 1628724607 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 (1628724463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101720 + ... + 116637.

It is an arithmetic number, because the mean of its divisors is an integer number (407237670).

Almost surely, 2^1628724863 is an apocalyptic number.

1628724863 is a deficient number, since it is larger than the sum of its proper divisors (225817).

1628724863 is an equidigital number, since it uses as much as digits as its factorization.

1628724863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225816.

The product of its digits is 774144, while the sum is 47.

The square root of 1628724863 is about 40357.4635352620. The cubic root of 1628724863 is about 1176.5649557597.

The spelling of 1628724863 in words is "one billion, six hundred twenty-eight million, seven hundred twenty-four thousand, eight hundred sixty-three".