1628225738 has 8 divisors (see below), whose sum is σ = 2442631140. Its totient is φ = 814015360.

The previous prime is 1628225717. The next prime is 1628225771. The reversal of 1628225738 is 8375228261.

It can be written as a sum of positive squares in 2 ways, for example, as 1316456089 + 311769649 = 36283^2 + 17657^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1628225738² = 5302238107771289288, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25703 + ... + 62586.

Almost surely, 2^1628225738 is an apocalyptic number.

1628225738 is a deficient number, since it is larger than the sum of its proper divisors (814405402).

1628225738 is an equidigital number, since it uses as much as digits as its factorization.

1628225738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97512.

The product of its digits is 322560, while the sum is 44.

The square root of 1628225738 is about 40351.2792610098. The cubic root of 1628225738 is about 1176.4447568247. Note that the first 3 decimals are identical.

The spelling of 1628225738 in words is "one billion, six hundred twenty-eight million, two hundred twenty-five thousand, seven hundred thirty-eight".