478655993 has 4 divisors (see below), whose sum is σ = 478700148. Its totient is φ = 478611840.

The previous prime is 478655929. The next prime is 478656007. The reversal of 478655993 is 399556874.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 227496889 + 251159104 = 15083^2 + 15848^2 .

It is a cyclic number.

It is not a de Polignac number, because 478655993 - 2⁶ = 478655929 is a prime.

It is a super-2 number, since 2×478655993² = 458223119269632098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (478655293) 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, 6605 + ... + 31637.

It is an arithmetic number, because the mean of its divisors is an integer number (119675037).

Almost surely, 2^478655993 is an apocalyptic number.

It is an amenable number.

478655993 is a deficient number, since it is larger than the sum of its proper divisors (44155).

478655993 is a wasteful number, since it uses less digits than its factorization.

478655993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44154.

The product of its digits is 8164800, while the sum is 56.

The square root of 478655993 is about 21878.2081761738. The cubic root of 478655993 is about 782.2420660076.

The spelling of 478655993 in words is "four hundred seventy-eight million, six hundred fifty-five thousand, nine hundred ninety-three".