19877648460 has 24 divisors (see below), whose sum is σ = 55657415856. Its totient is φ = 5300706240.

The previous prime is 19877648449. The next prime is 19877648471. The reversal of 19877648460 is 6484677891.

It is an interprime number because it is at equal distance from previous prime (19877648449) and next prime (19877648471).

It is a Harshad number since it is a multiple of its sum of digits (60), and also a Moran number because the ratio is a prime number: 331294141 = 19877648460 / (1 + 9 + 8 + 7 + 7 + 6 + 4 + 8 + 4 + 6 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 19877648394 and 19877648403.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165647011 + ... + 165647130.

It is an arithmetic number, because the mean of its divisors is an integer number (2319058994).

Almost surely, 2^19877648460 is an apocalyptic number.

19877648460 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19877648460 is an abundant number, since it is smaller than the sum of its proper divisors (35779767396).

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

19877648460 is a wasteful number, since it uses less digits than its factorization.

19877648460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331294153 (or 331294151 counting only the distinct ones).

The product of its (nonzero) digits is 16257024, while the sum is 60.

The spelling of 19877648460 in words is "nineteen billion, eight hundred seventy-seven million, six hundred forty-eight thousand, four hundred sixty".