3870728 has 16 divisors (see below), whose sum is σ = 7435260. Its totient is φ = 1888000.

The previous prime is 3870721. The next prime is 3870751. The reversal of 3870728 is 8270783.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3602404 + 268324 = 1898^2 + 518^2 .

It is not an unprimeable number, because it can be changed into a prime (3870721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5573 + ... + 6228.

Almost surely, 2^3870728 is an apocalyptic number.

It is an amenable number.

3870728 is a deficient number, since it is larger than the sum of its proper divisors (3564532).

3870728 is a wasteful number, since it uses less digits than its factorization.

3870728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11848 (or 11844 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 3870728 is about 1967.4165801883. The cubic root of 3870728 is about 157.0112910592.

The spelling of 3870728 in words is "three million, eight hundred seventy thousand, seven hundred twenty-eight".