1028138870 has 64 divisors (see below), whose sum is σ = 2174791680. Its totient is φ = 346051200.

The previous prime is 1028138843. The next prime is 1028138899. The reversal of 1028138870 is 788318201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 71876 + ... + 84984.

It is an arithmetic number, because the mean of its divisors is an integer number (33981120).

Almost surely, 2^1028138870 is an apocalyptic number.

1028138870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1028138870 is an abundant number, since it is smaller than the sum of its proper divisors (1146652810).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1028138870 is a wasteful number, since it uses less digits than its factorization.

1028138870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13181.

The product of its (nonzero) digits is 21504, while the sum is 38.

The square root of 1028138870 is about 32064.6046287803. The cubic root of 1028138870 is about 1009.2929960442.

The spelling of 1028138870 in words is "one billion, twenty-eight million, one hundred thirty-eight thousand, eight hundred seventy".