19790664 has 64 divisors (see below), whose sum is σ = 51363840. Its totient is φ = 6350400.

The previous prime is 19790653. The next prime is 19790699. The reversal of 19790664 is 46609791.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130989 + ... + 131139.

It is an arithmetic number, because the mean of its divisors is an integer number (802560).

Almost surely, 2^19790664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19790664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25681920).

19790664 is an abundant number, since it is smaller than the sum of its proper divisors (31573176).

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

19790664 is a wasteful number, since it uses less digits than its factorization.

19790664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330 (or 326 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 19790664 is about 4448.6699135809. The cubic root of 19790664 is about 270.4913959336.

The spelling of 19790664 in words is "nineteen million, seven hundred ninety thousand, six hundred sixty-four".