19664048628 has 72 divisors (see below), whose sum is σ = 59277149568. Its totient is φ = 5374024128.

The previous prime is 19664048627. The next prime is 19664048629. The reversal of 19664048628 is 82684046691.

19664048628 is a `hidden beast` number, since 1 + 9 + 6 + 6 + 4 + 0 + 4 + 8 + 628 = 666.

It is an interprime number because it is at equal distance from previous prime (19664048627) and next prime (19664048629).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19664048623) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1690551 + ... + 1702142.

It is an arithmetic number, because the mean of its divisors is an integer number (823293744).

Almost surely, 2^19664048628 is an apocalyptic number.

19664048628 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

19664048628 is an abundant number, since it is smaller than the sum of its proper divisors (39613100940).

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

19664048628 is a wasteful number, since it uses less digits than its factorization.

19664048628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3392733 (or 3392728 counting only the distinct ones).

The product of its (nonzero) digits is 3981312, while the sum is 54.

The spelling of 19664048628 in words is "nineteen billion, six hundred sixty-four million, forty-eight thousand, six hundred twenty-eight".