671178420 has 288 divisors, whose sum is σ = 2411821440. Its totient is φ = 153653760.

The previous prime is 671178413. The next prime is 671178449. The reversal of 671178420 is 24871176.

671178420 is a `hidden beast` number, since 67 + 1 + 178 + 420 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2144184 + ... + 2144496.

It is an arithmetic number, because the mean of its divisors is an integer number (8374380).

Almost surely, 2^671178420 is an apocalyptic number.

671178420 is a gapful number since it is divisible by the number (60) 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 671178420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1205910720).

671178420 is an abundant number, since it is smaller than the sum of its proper divisors (1740643020).

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

671178420 is a wasteful number, since it uses less digits than its factorization.

671178420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380 (or 353 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 671178420 is about 25907.1113789245. Note that the first 3 decimals coincide. The cubic root of 671178420 is about 875.5467255297.

The spelling of 671178420 in words is "six hundred seventy-one million, one hundred seventy-eight thousand, four hundred twenty".