390771728 has 10 divisors (see below), whose sum is σ = 757120254. Its totient is φ = 195385856.

The previous prime is 390771713. The next prime is 390771739. The reversal of 390771728 is 827177093.

It can be written as a sum of positive squares in only one way, i.e., 227647744 + 163123984 = 15088^2 + 12772^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12211601 + ... + 12211632.

Almost surely, 2^390771728 is an apocalyptic number.

It is an amenable number.

390771728 is a deficient number, since it is larger than the sum of its proper divisors (366348526).

390771728 is a wasteful number, since it uses less digits than its factorization.

390771728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24423241 (or 24423235 counting only the distinct ones).

The product of its (nonzero) digits is 148176, while the sum is 44.

The square root of 390771728 is about 19767.9469849552. The cubic root of 390771728 is about 731.0959506209.

The spelling of 390771728 in words is "three hundred ninety million, seven hundred seventy-one thousand, seven hundred twenty-eight".