1628879617 has 4 divisors (see below), whose sum is σ = 1629017856. Its totient is φ = 1628741380.

The previous prime is 1628879543. The next prime is 1628879641. The reversal of 1628879617 is 7169788261.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7169788261 = 1171 ⋅6122791.

It is a cyclic number.

It is not a de Polignac number, because 1628879617 - 2⁷ = 1628879489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1628879647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49609 + ... + 75622.

It is an arithmetic number, because the mean of its divisors is an integer number (407254464).

Almost surely, 2^1628879617 is an apocalyptic number.

It is an amenable number.

1628879617 is a deficient number, since it is larger than the sum of its proper divisors (138239).

1628879617 is a wasteful number, since it uses less digits than its factorization.

1628879617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138238.

The product of its digits is 2032128, while the sum is 55.

The square root of 1628879617 is about 40359.3807806810. The cubic root of 1628879617 is about 1176.6022185229.

The spelling of 1628879617 in words is "one billion, six hundred twenty-eight million, eight hundred seventy-nine thousand, six hundred seventeen".