19528242638 has 4 divisors (see below), whose sum is σ = 29292363960. Its totient is φ = 9764121318.

The previous prime is 19528242631. The next prime is 19528242649. The reversal of 19528242638 is 83624282591.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19528242631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4882060658 + ... + 4882060661.

It is an arithmetic number, because the mean of its divisors is an integer number (7323090990).

Almost surely, 2^19528242638 is an apocalyptic number.

19528242638 is a deficient number, since it is larger than the sum of its proper divisors (9764121322).

19528242638 is an equidigital number, since it uses as much as digits as its factorization.

19528242638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9764121321.

The product of its digits is 1658880, while the sum is 50.

The spelling of 19528242638 in words is "nineteen billion, five hundred twenty-eight million, two hundred forty-two thousand, six hundred thirty-eight".