19764648 has 56 divisors (see below), whose sum is σ = 55579050. Its totient is φ = 6586272.

The previous prime is 19764637. The next prime is 19764653. The reversal of 19764648 is 84646791.

It can be written as a sum of positive squares in only one way, i.e., 11573604 + 8191044 = 3402^2 + 2862^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 4138 + ... + 7526.

Almost surely, 2^19764648 is an apocalyptic number.

19764648 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19764648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27789525).

19764648 is an abundant number, since it is smaller than the sum of its proper divisors (35814402).

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

19764648 is an equidigital number, since it uses as much as digits as its factorization.

19764648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3413 (or 3394 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 19764648 is about 4445.7449319546. The cubic root of 19764648 is about 270.3728183057.

The spelling of 19764648 in words is "nineteen million, seven hundred sixty-four thousand, six hundred forty-eight".