1642680 has 144 divisors (see below), whose sum is σ = 5995080. Its totient is φ = 404352.

The previous prime is 1642679. The next prime is 1642699. The reversal of 1642680 is 862461.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 126354 + ... + 126366.

2^1642680 is an apocalyptic number.

1642680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1642680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2997540).

1642680 is an abundant number, since it is smaller than the sum of its proper divisors (4352400).

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

1642680 is a wasteful number, since it uses less digits than its factorization.

1642680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52 (or 23 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 1642680 is about 1281.6707845621. The cubic root of 1642680 is about 117.9915727008.

The spelling of 1642680 in words is "one million, six hundred forty-two thousand, six hundred eighty".