1630855680 has 160 divisors (see below), whose sum is σ = 5256681408. Its totient is φ = 431308800.

The previous prime is 1630855651. The next prime is 1630855691. The reversal of 1630855680 is 865580361.

It is a tau number, because it is divible by the number of its divisors (160).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1005270 + ... + 1006890.

Almost surely, 2^1630855680 is an apocalyptic number.

1630855680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1630855680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2628340704).

1630855680 is an abundant number, since it is smaller than the sum of its proper divisors (3625825728).

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

1630855680 is a wasteful number, since it uses less digits than its factorization.

1630855680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1778 (or 1762 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 42.

The square root of 1630855680 is about 40383.8541994198. The cubic root of 1630855680 is about 1177.0778216138.

The spelling of 1630855680 in words is "one billion, six hundred thirty million, eight hundred fifty-five thousand, six hundred eighty".