1634643020 has 48 divisors (see below), whose sum is σ = 3548095488. Its totient is φ = 631942080.

The previous prime is 1634642993. The next prime is 1634643053. The reversal of 1634643020 is 203464361.

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, 719927 + ... + 722193.

It is an arithmetic number, because the mean of its divisors is an integer number (73918656).

Almost surely, 2^1634643020 is an apocalyptic number.

1634643020 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 1634643020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1774047744).

1634643020 is an abundant number, since it is smaller than the sum of its proper divisors (1913452468).

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

1634643020 is a wasteful number, since it uses less digits than its factorization.

1634643020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3470 (or 3468 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 1634643020 is about 40430.7187667991. The cubic root of 1634643020 is about 1177.9882940486.

The spelling of 1634643020 in words is "one billion, six hundred thirty-four million, six hundred forty-three thousand, twenty".