1628605398 has 64 divisors (see below), whose sum is σ = 3855237120. Its totient is φ = 448826400.

The previous prime is 1628605397. The next prime is 1628605441. The reversal of 1628605398 is 8935068261.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1628605397) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 429073 + ... + 432851.

It is an arithmetic number, because the mean of its divisors is an integer number (60238080).

Almost surely, 2^1628605398 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1628605398, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1927618560).

1628605398 is an abundant number, since it is smaller than the sum of its proper divisors (2226631722).

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

1628605398 is a wasteful number, since it uses less digits than its factorization.

1628605398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4153.

The product of its (nonzero) digits is 622080, while the sum is 48.

The square root of 1628605398 is about 40355.9834225360. The cubic root of 1628605398 is about 1176.5361885172.

The spelling of 1628605398 in words is "one billion, six hundred twenty-eight million, six hundred five thousand, three hundred ninety-eight".