1630689858 has 96 divisors (see below), whose sum is σ = 4260771840. Its totient is φ = 440316000.

The previous prime is 1630689829. The next prime is 1630689871. The reversal of 1630689858 is 8589860361.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1797441 + ... + 1798347.

It is an arithmetic number, because the mean of its divisors is an integer number (44383040).

Almost surely, 2^1630689858 is an apocalyptic number.

1630689858 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1630689858, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2130385920).

1630689858 is an abundant number, since it is smaller than the sum of its proper divisors (2630081982).

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

1630689858 is a wasteful number, since it uses less digits than its factorization.

1630689858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1692 (or 1689 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 54.

The square root of 1630689858 is about 40381.8010742463. The cubic root of 1630689858 is about 1177.0379259899.

The spelling of 1630689858 in words is "one billion, six hundred thirty million, six hundred eighty-nine thousand, eight hundred fifty-eight".