478774917 has 24 divisors (see below), whose sum is σ = 721827288. Its totient is φ = 305510400.

The previous prime is 478774913. The next prime is 478774963. The reversal of 478774917 is 719477874.

It can be written as a sum of positive squares in 4 ways, for example, as 6625476 + 472149441 = 2574^2 + 21729^2 .

It is not a de Polignac number, because 478774917 - 2² = 478774913 is a prime.

It is a super-2 number, since 2×478774917² = 458450842296713778, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (478774913) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7317 + ... + 31797.

It is an arithmetic number, because the mean of its divisors is an integer number (30076137).

Almost surely, 2^478774917 is an apocalyptic number.

It is an amenable number.

478774917 is a deficient number, since it is larger than the sum of its proper divisors (243052371).

478774917 is a wasteful number, since it uses less digits than its factorization.

478774917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24581 (or 24578 counting only the distinct ones).

The product of its digits is 2765952, while the sum is 54.

The square root of 478774917 is about 21880.9258716353. The cubic root of 478774917 is about 782.3068443686.

The spelling of 478774917 in words is "four hundred seventy-eight million, seven hundred seventy-four thousand, nine hundred seventeen".