1650664 has 16 divisors (see below), whose sum is σ = 3229920. Its totient is φ = 789360.

The previous prime is 1650659. The next prime is 1650667. The reversal of 1650664 is 4660561.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1650667) 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, 4302 + ... + 4669.

It is an arithmetic number, because the mean of its divisors is an integer number (201870).

2^1650664 is an apocalyptic number.

It is an amenable number.

1650664 is a deficient number, since it is larger than the sum of its proper divisors (1579256).

1650664 is a wasteful number, since it uses less digits than its factorization.

1650664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9000 (or 8996 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 1650664 is about 1284.7816935184. The cubic root of 1650664 is about 118.1824239524.

The spelling of 1650664 in words is "one million, six hundred fifty thousand, six hundred sixty-four".