1628609790 has 64 divisors (see below), whose sum is σ = 4016900160. Its totient is φ = 422338560.

The previous prime is 1628609777. The next prime is 1628609867. The reversal of 1628609790 is 979068261.

1628609790 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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, 412546 + ... + 416474.

It is an arithmetic number, because the mean of its divisors is an integer number (62764065).

Almost surely, 2^1628609790 is an apocalyptic number.

1628609790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1628609790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2008450080).

1628609790 is an abundant number, since it is smaller than the sum of its proper divisors (2388290370).

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

1628609790 is a wasteful number, since it uses less digits than its factorization.

1628609790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4317.

The product of its (nonzero) digits is 326592, while the sum is 48.

The square root of 1628609790 is about 40356.0378382219. The cubic root of 1628609790 is about 1176.5372461383.

The spelling of 1628609790 in words is "one billion, six hundred twenty-eight million, six hundred nine thousand, seven hundred ninety".