1628671761 has 6 divisors (see below), whose sum is σ = 2352525890. Its totient is φ = 1085781168.

The previous prime is 1628671747. The next prime is 1628671799. The reversal of 1628671761 is 1671768261.

1628671761 is a `hidden beast` number, since 1 + 628 + 6 + 7 + 17 + 6 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1628606736 + 65025 = 40356^2 + 255^2 .

It is not a de Polignac number, because 1628671761 - 2⁵ = 1628671729 is a prime.

It is a super-2 number, since 2×1628671761² = 5305143410157682242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1628671721) 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 5 ways as a sum of consecutive naturals, for example, 90481756 + ... + 90481773.

Almost surely, 2^1628671761 is an apocalyptic number.

It is an amenable number.

1628671761 is a deficient number, since it is larger than the sum of its proper divisors (723854129).

1628671761 is a wasteful number, since it uses less digits than its factorization.

1628671761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180963535 (or 180963532 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 1628671761 is about 40356.8056342422. The cubic root of 1628671761 is about 1176.5521689405.

The spelling of 1628671761 in words is "one billion, six hundred twenty-eight million, six hundred seventy-one thousand, seven hundred sixty-one".