16640464 has 10 divisors (see below), whose sum is σ = 32240930. Its totient is φ = 8320224.

The previous prime is 16640453. The next prime is 16640473. The reversal of 16640464 is 46404661.

It can be written as a sum of positive squares in only one way, i.e., 10188864 + 6451600 = 3192^2 + 2540^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 519999 + ... + 520030.

It is an arithmetic number, because the mean of its divisors is an integer number (3224093).

Almost surely, 2^16640464 is an apocalyptic number.

It is an amenable number.

16640464 is a deficient number, since it is larger than the sum of its proper divisors (15600466).

16640464 is a wasteful number, since it uses less digits than its factorization.

16640464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1040037 (or 1040031 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 16640464 is about 4079.2724841569. The cubic root of 16640464 is about 255.3025449147.

The spelling of 16640464 in words is "sixteen million, six hundred forty thousand, four hundred sixty-four".