478166021 has 8 divisors (see below), whose sum is σ = 528306624. Its totient is φ = 430471360.

The previous prime is 478166011. The next prime is 478166023. The reversal of 478166021 is 120661874.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 478166021 - 2⁶ = 478165957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (478166023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 611075 + ... + 611856.

It is an arithmetic number, because the mean of its divisors is an integer number (66038328).

Almost surely, 2^478166021 is an apocalyptic number.

It is an amenable number.

478166021 is a deficient number, since it is larger than the sum of its proper divisors (50140603).

478166021 is a wasteful number, since it uses less digits than its factorization.

478166021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1222971.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 478166021 is about 21867.0075913464. The cubic root of 478166021 is about 781.9750631434.

The spelling of 478166021 in words is "four hundred seventy-eight million, one hundred sixty-six thousand, twenty-one".