19473387228 has 72 divisors (see below), whose sum is σ = 51085157760. Its totient is φ = 6486343920.

The previous prime is 19473387221. The next prime is 19473387233. The reversal of 19473387228 is 82278337491.

19473387228 is a `hidden beast` number, since 194 + 73 + 387 + 2 + 2 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19473387221) 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, 1462063 + ... + 1475321.

It is an arithmetic number, because the mean of its divisors is an integer number (709516080).

Almost surely, 2^19473387228 is an apocalyptic number.

19473387228 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 19473387228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25542578880).

19473387228 is an abundant number, since it is smaller than the sum of its proper divisors (31611770532).

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

19473387228 is a wasteful number, since it uses less digits than its factorization.

19473387228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14789 (or 14775 counting only the distinct ones).

The product of its digits is 4064256, while the sum is 54.

It can be divided in two parts, 194733 and 87228, that added together give a square (281961 = 531²).

The spelling of 19473387228 in words is "nineteen billion, four hundred seventy-three million, three hundred eighty-seven thousand, two hundred twenty-eight".