1667628 has 30 divisors (see below), whose sum is σ = 4360356. Its totient is φ = 555768.

The previous prime is 1667623. The next prime is 1667629. The reversal of 1667628 is 8267661.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1667592 and 1667601.

It is not an unprimeable number, because it can be changed into a prime (1667623) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2250 + ... + 2897.

2^1667628 is an apocalyptic number.

1667628 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1667628 is an abundant number, since it is smaller than the sum of its proper divisors (2692728).

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

1667628 is a wasteful number, since it uses less digits than its factorization.

1667628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5163 (or 5152 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 1667628 is about 1291.3667178614. The cubic root of 1667628 is about 118.5859015022.

The spelling of 1667628 in words is "one million, six hundred sixty-seven thousand, six hundred twenty-eight".