478251638 has 4 divisors (see below), whose sum is σ = 717377460. Its totient is φ = 239125818.

The previous prime is 478251637. The next prime is 478251659. The reversal of 478251638 is 836152874.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (478251637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119562908 + ... + 119562911.

It is an arithmetic number, because the mean of its divisors is an integer number (179344365).

Almost surely, 2^478251638 is an apocalyptic number.

478251638 is a deficient number, since it is larger than the sum of its proper divisors (239125822).

478251638 is a wasteful number, since it uses less digits than its factorization.

478251638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239125821.

The product of its digits is 322560, while the sum is 44.

The square root of 478251638 is about 21868.9651789928. The cubic root of 478251638 is about 782.0217319855.

The spelling of 478251638 in words is "four hundred seventy-eight million, two hundred fifty-one thousand, six hundred thirty-eight".