478106621 has 4 divisors (see below), whose sum is σ = 478735644. Its totient is φ = 477477600.

The previous prime is 478106611. The next prime is 478106627. The reversal of 478106621 is 126601874.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11978521 + 466128100 = 3461^2 + 21590^2 .

It is a cyclic number.

It is not a de Polignac number, because 478106621 - 2¹⁴ = 478090237 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (478106627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 313370 + ... + 314891.

It is an arithmetic number, because the mean of its divisors is an integer number (119683911).

Almost surely, 2^478106621 is an apocalyptic number.

It is an amenable number.

478106621 is a deficient number, since it is larger than the sum of its proper divisors (629023).

478106621 is an equidigital number, since it uses as much as digits as its factorization.

478106621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629022.

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

The square root of 478106621 is about 21865.6493386316. The cubic root of 478106621 is about 781.9426816133.

The spelling of 478106621 in words is "four hundred seventy-eight million, one hundred six thousand, six hundred twenty-one".