478987549 has 4 divisors (see below), whose sum is σ = 504197440. Its totient is φ = 453777660.

The previous prime is 478987517. The next prime is 478987559. The reversal of 478987549 is 945789874.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 478987549 - 2⁵ = 478987517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (478987559) 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, 12604917 + ... + 12604954.

It is an arithmetic number, because the mean of its divisors is an integer number (126049360).

Almost surely, 2^478987549 is an apocalyptic number.

It is an amenable number.

478987549 is a deficient number, since it is larger than the sum of its proper divisors (25209891).

478987549 is a wasteful number, since it uses less digits than its factorization.

478987549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25209890.

The product of its digits is 20321280, while the sum is 61.

The square root of 478987549 is about 21885.7841760354. The cubic root of 478987549 is about 782.4226391077.

The spelling of 478987549 in words is "four hundred seventy-eight million, nine hundred eighty-seven thousand, five hundred forty-nine".