1642128790 has 16 divisors (see below), whose sum is σ = 2958814512. Its totient is φ = 656188704.

The previous prime is 1642128781. The next prime is 1642128793. The reversal of 1642128790 is 978212461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642128793) 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, 72384 + ... + 92323.

It is an arithmetic number, because the mean of its divisors is an integer number (184925907).

Almost surely, 2^1642128790 is an apocalyptic number.

1642128790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1642128790 is a deficient number, since it is larger than the sum of its proper divisors (1316685722).

1642128790 is a wasteful number, since it uses less digits than its factorization.

1642128790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165711.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 1642128790 is about 40523.1883000338. The cubic root of 1642128790 is about 1179.7837365807.

The spelling of 1642128790 in words is "one billion, six hundred forty-two million, one hundred twenty-eight thousand, seven hundred ninety".