19664998 has 8 divisors (see below), whose sum is σ = 29572992. Its totient is φ = 9807336.

The previous prime is 19664993. The next prime is 19665007. The reversal of 19664998 is 89946691.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19664993) 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, 11590 + ... + 13177.

It is an arithmetic number, because the mean of its divisors is an integer number (3696624).

Almost surely, 2^19664998 is an apocalyptic number.

19664998 is a deficient number, since it is larger than the sum of its proper divisors (9907994).

19664998 is a wasteful number, since it uses less digits than its factorization.

19664998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25166.

The product of its digits is 839808, while the sum is 52.

The square root of 19664998 is about 4434.5234242250. The cubic root of 19664998 is about 269.9176612210.

The spelling of 19664998 in words is "nineteen million, six hundred sixty-four thousand, nine hundred ninety-eight".