728644478 has 32 divisors (see below), whose sum is σ = 1151483904. Its totient is φ = 345395232.

The previous prime is 728644403. The next prime is 728644481. The reversal of 728644478 is 874446827.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1331801 + ... + 1332347.

It is an arithmetic number, because the mean of its divisors is an integer number (35983872).

Almost surely, 2^728644478 is an apocalyptic number.

728644478 is a deficient number, since it is larger than the sum of its proper divisors (422839426).

728644478 is a wasteful number, since it uses less digits than its factorization.

728644478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1016.

The product of its digits is 2408448, while the sum is 50.

The square root of 728644478 is about 26993.4154563664. The cubic root of 728644478 is about 899.8536708601.

The spelling of 728644478 in words is "seven hundred twenty-eight million, six hundred forty-four thousand, four hundred seventy-eight".