398776728 has 64 divisors (see below), whose sum is σ = 1141378560. Its totient is φ = 113734656.

The previous prime is 398776649. The next prime is 398776733. The reversal of 398776728 is 827677893.

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, 111301 + ... + 114827.

It is an arithmetic number, because the mean of its divisors is an integer number (17834040).

Almost surely, 2^398776728 is an apocalyptic number.

It is an amenable number.

398776728 is an abundant number, since it is smaller than the sum of its proper divisors (742601832).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

398776728 is a wasteful number, since it uses less digits than its factorization.

398776728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4216 (or 4212 counting only the distinct ones).

The product of its digits is 7112448, while the sum is 57.

The square root of 398776728 is about 19969.3947830173. The cubic root of 398776728 is about 736.0544373330.

The spelling of 398776728 in words is "three hundred ninety-eight million, seven hundred seventy-six thousand, seven hundred twenty-eight".