667173420 has 144 divisors (see below), whose sum is σ = 2184960960. Its totient is φ = 164279808.

The previous prime is 667173389. The next prime is 667173431. The reversal of 667173420 is 24371766.

667173420 is a `hidden beast` number, since 6 + 67 + 173 + 420 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 117282 + ... + 122838.

It is an arithmetic number, because the mean of its divisors is an integer number (15173340).

Almost surely, 2^667173420 is an apocalyptic number.

667173420 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 667173420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1092480480).

667173420 is an abundant number, since it is smaller than the sum of its proper divisors (1517787540).

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

667173420 is a wasteful number, since it uses less digits than its factorization.

667173420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5624 (or 5619 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 36.

The square root of 667173420 is about 25829.7003466939. The cubic root of 667173420 is about 873.8017535826.

The spelling of 667173420 in words is "six hundred sixty-seven million, one hundred seventy-three thousand, four hundred twenty".