1628225828 has 6 divisors (see below), whose sum is σ = 2849395206. Its totient is φ = 814112912.

The previous prime is 1628225789. The next prime is 1628225849. The reversal of 1628225828 is 8285228261.

It can be written as a sum of positive squares in only one way, i.e., 1497535204 + 130690624 = 38698^2 + 11432^2 .

It is a super-2 number, since 2×1628225828² = 5302238693932571168, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203528225 + ... + 203528232.

It is an arithmetic number, because the mean of its divisors is an integer number (474899201).

Almost surely, 2^1628225828 is an apocalyptic number.

It is an amenable number.

1628225828 is a deficient number, since it is larger than the sum of its proper divisors (1221169378).

1628225828 is a wasteful number, since it uses less digits than its factorization.

1628225828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407056461 (or 407056459 counting only the distinct ones).

The product of its digits is 245760, while the sum is 44.

The square root of 1628225828 is about 40351.2803762161. The cubic root of 1628225828 is about 1176.4447785006. Note that the first 3 decimals are identical.

The spelling of 1628225828 in words is "one billion, six hundred twenty-eight million, two hundred twenty-five thousand, eight hundred twenty-eight".