1028147906 has 4 divisors (see below), whose sum is σ = 1542221862. Its totient is φ = 514073952.

The previous prime is 1028147899. The next prime is 1028147921. The reversal of 1028147906 is 6097418201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6097418201 = 7 ⋅871059743.

It can be written as a sum of positive squares in only one way, i.e., 893471881 + 134676025 = 29891^2 + 11605^2 .

It is a super-2 number, since 2×1028147906² = 2114176233224369672, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1028147906.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 257036975 + ... + 257036978.

Almost surely, 2^1028147906 is an apocalyptic number.

1028147906 is a deficient number, since it is larger than the sum of its proper divisors (514073956).

1028147906 is an equidigital number, since it uses as much as digits as its factorization.

1028147906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 514073955.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 1028147906 is about 32064.7455315024. The cubic root of 1028147906 is about 1009.2959528253.

The spelling of 1028147906 in words is "one billion, twenty-eight million, one hundred forty-seven thousand, nine hundred six".