478877721 has 16 divisors (see below), whose sum is σ = 730060800. Its totient is φ = 273516048.

The previous prime is 478877681. The next prime is 478877753. The reversal of 478877721 is 127778874.

It is not a de Polignac number, because 478877721 - 2⁷ = 478877593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (478872721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57840 + ... + 65598.

It is an arithmetic number, because the mean of its divisors is an integer number (45628800).

Almost surely, 2^478877721 is an apocalyptic number.

It is an amenable number.

478877721 is a deficient number, since it is larger than the sum of its proper divisors (251183079).

478877721 is a wasteful number, since it uses less digits than its factorization.

478877721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10708.

The product of its digits is 1229312, while the sum is 51.

The square root of 478877721 is about 21883.2749148751. The cubic root of 478877721 is about 782.3628334597.

The spelling of 478877721 in words is "four hundred seventy-eight million, eight hundred seventy-seven thousand, seven hundred twenty-one".