478163621 has 4 divisors (see below), whose sum is σ = 514945452. Its totient is φ = 441381792.

The previous prime is 478163611. The next prime is 478163659. The reversal of 478163621 is 126361874.

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 40768225 + 437395396 = 6385^2 + 20914^2 .

It is a cyclic number.

It is not a de Polignac number, because 478163621 - 2²² = 473969317 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 (478163611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18390896 + ... + 18390921.

It is an arithmetic number, because the mean of its divisors is an integer number (128736363).

Almost surely, 2^478163621 is an apocalyptic number.

It is an amenable number.

478163621 is a deficient number, since it is larger than the sum of its proper divisors (36781831).

478163621 is a wasteful number, since it uses less digits than its factorization.

478163621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36781830.

The product of its digits is 48384, while the sum is 38.

The square root of 478163621 is about 21866.9527140843. The cubic root of 478163621 is about 781.9737548508.

The spelling of 478163621 in words is "four hundred seventy-eight million, one hundred sixty-three thousand, six hundred twenty-one".