19508625408 has 72 divisors (see below), whose sum is σ = 52023851208. Its totient is φ = 6502744064.

The previous prime is 19508625403. The next prime is 19508625419. The reversal of 19508625408 is 80452680591.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19508625403) 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, 368410 + ... + 418022.

It is an arithmetic number, because the mean of its divisors is an integer number (722553489).

Almost surely, 2^19508625408 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 19508625408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26011925604).

19508625408 is an abundant number, since it is smaller than the sum of its proper divisors (32515225800).

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

19508625408 is an frugal number, since it uses more digits than its factorization.

19508625408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49650 (or 49618 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 48.

The spelling of 19508625408 in words is "nineteen billion, five hundred eight million, six hundred twenty-five thousand, four hundred eight".