1628690 has 32 divisors (see below), whose sum is σ = 3421440. Its totient is φ = 546624.

The previous prime is 1628689. The next prime is 1628701. The reversal of 1628690 is 968261.

It is a super-2 number, since 2×1628690² = 5305262232200, which contains 22 as substring.

It is an Ulam number.

It is a Curzon number.

It is a nialpdrome in base 12.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3491 + ... + 3929.

It is an arithmetic number, because the mean of its divisors is an integer number (106920).

2^1628690 is an apocalyptic number.

1628690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1628690 is an abundant number, since it is smaller than the sum of its proper divisors (1792750).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1628690 is a wasteful number, since it uses less digits than its factorization.

1628690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 1628690 is about 1276.2013947649. The cubic root of 1628690 is about 117.6556560874.

The spelling of 1628690 in words is "one million, six hundred twenty-eight thousand, six hundred ninety".