1028665140 has 24 divisors (see below), whose sum is σ = 2880262560. Its totient is φ = 274310688.

The previous prime is 1028665139. The next prime is 1028665147. The reversal of 1028665140 is 415668201.

1028665140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1028665147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8572150 + ... + 8572269.

It is an arithmetic number, because the mean of its divisors is an integer number (120010940).

Almost surely, 2^1028665140 is an apocalyptic number.

1028665140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1028665140 is an abundant number, since it is smaller than the sum of its proper divisors (1851597420).

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

1028665140 is a wasteful number, since it uses less digits than its factorization.

1028665140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17144431 (or 17144429 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 1028665140 is about 32072.8099797944. The cubic root of 1028665140 is about 1009.4651744786.

The spelling of 1028665140 in words is "one billion, twenty-eight million, six hundred sixty-five thousand, one hundred forty".