478642551 has 8 divisors (see below), whose sum is σ = 638292480. Its totient is φ = 319043832.

The previous prime is 478642543. The next prime is 478642583. The reversal of 478642551 is 155246874.

It is a happy number.

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

It is not a de Polignac number, because 478642551 - 2³ = 478642543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (478642951) 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, 24730 + ... + 39608.

It is an arithmetic number, because the mean of its divisors is an integer number (79786560).

Almost surely, 2^478642551 is an apocalyptic number.

478642551 is a deficient number, since it is larger than the sum of its proper divisors (159649929).

478642551 is a wasteful number, since it uses less digits than its factorization.

478642551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25605.

The product of its digits is 268800, while the sum is 42.

The square root of 478642551 is about 21877.9009733567. The cubic root of 478642551 is about 782.2347434235.

The spelling of 478642551 in words is "four hundred seventy-eight million, six hundred forty-two thousand, five hundred fifty-one".