478478991 has 8 divisors (see below), whose sum is σ = 675499824. Its totient is φ = 300222080.

The previous prime is 478478969. The next prime is 478479007. The reversal of 478478991 is 199874874.

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 478478991 - 2⁹ = 478478479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (478478491) 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, 4690920 + ... + 4691021.

It is an arithmetic number, because the mean of its divisors is an integer number (84437478).

Almost surely, 2^478478991 is an apocalyptic number.

478478991 is a deficient number, since it is larger than the sum of its proper divisors (197020833).

478478991 is a wasteful number, since it uses less digits than its factorization.

478478991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9381961.

The product of its digits is 4064256, while the sum is 57.

The square root of 478478991 is about 21874.1626354016. The cubic root of 478478991 is about 782.1456324642.

The spelling of 478478991 in words is "four hundred seventy-eight million, four hundred seventy-eight thousand, nine hundred ninety-one".