1628761 has 4 divisors (see below), whose sum is σ = 1655524. Its totient is φ = 1602000.

The previous prime is 1628747. The next prime is 1628773. The reversal of 1628761 is 1678261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1678261 = 13 ⋅129097.

It can be written as a sum of positive squares in 2 ways, for example, as 81225 + 1547536 = 285^2 + 1244^2 .

It is a cyclic number.

It is not a de Polignac number, because 1628761 - 2⁵ = 1628729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1628701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13290 + ... + 13411.

It is an arithmetic number, because the mean of its divisors is an integer number (413881).

2^1628761 is an apocalyptic number.

It is an amenable number.

1628761 is a deficient number, since it is larger than the sum of its proper divisors (26763).

1628761 is an equidigital number, since it uses as much as digits as its factorization.

1628761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26762.

The product of its digits is 4032, while the sum is 31.

The square root of 1628761 is about 1276.2292113880. The cubic root of 1628761 is about 117.6573657294.

The spelling of 1628761 in words is "one million, six hundred twenty-eight thousand, seven hundred sixty-one".