1628890 has 8 divisors (see below), whose sum is σ = 2932020. Its totient is φ = 651552.

The previous prime is 1628881. The next prime is 1628897. The reversal of 1628890 is 988261.

It can be written as a sum of positive squares in 2 ways, for example, as 1580049 + 48841 = 1257^2 + 221^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a plaindrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (1628897) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81435 + ... + 81454.

2^1628890 is an apocalyptic number.

1628890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1628890 is a deficient number, since it is larger than the sum of its proper divisors (1303130).

1628890 is a wasteful number, since it uses less digits than its factorization.

1628890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162896.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 1628890 is about 1276.2797498981. The cubic root of 1628890 is about 117.6604718531.

The spelling of 1628890 in words is "one million, six hundred twenty-eight thousand, eight hundred ninety".