1642664 has 32 divisors (see below), whose sum is σ = 3304800. Its totient is φ = 763200.

The previous prime is 1642661. The next prime is 1642679. The reversal of 1642664 is 4662461.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (1642661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15299 + ... + 15405.

It is an arithmetic number, because the mean of its divisors is an integer number (103275).

2^1642664 is an apocalyptic number.

It is an amenable number.

1642664 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

1642664 is a wasteful number, since it uses less digits than its factorization.

1642664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233 (or 229 counting only the distinct ones).

The product of its digits is 6912, while the sum is 29.

The square root of 1642664 is about 1281.6645426944. The cubic root of 1642664 is about 117.9911896132.

The spelling of 1642664 in words is "one million, six hundred forty-two thousand, six hundred sixty-four".