6478478420 has 12 divisors (see below), whose sum is σ = 13604804724. Its totient is φ = 2591391360.

The previous prime is 6478478401. The next prime is 6478478453. The reversal of 6478478420 is 248748746.

It can be written as a sum of positive squares in 2 ways, for example, as 2050640656 + 4427837764 = 45284^2 + 66542^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161961941 + ... + 161961980.

It is an arithmetic number, because the mean of its divisors is an integer number (1133733727).

Almost surely, 2^6478478420 is an apocalyptic number.

It is an amenable number.

6478478420 is an abundant number, since it is smaller than the sum of its proper divisors (7126326304).

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

6478478420 is a wasteful number, since it uses less digits than its factorization.

6478478420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323923930 (or 323923928 counting only the distinct ones).

The product of its (nonzero) digits is 2408448, while the sum is 50.

The square root of 6478478420 is about 80488.9956453676. The cubic root of 6478478420 is about 1864.1935692223.

The spelling of 6478478420 in words is "six billion, four hundred seventy-eight million, four hundred seventy-eight thousand, four hundred twenty".