1645348100 has 36 divisors (see below), whose sum is σ = 3894990288. Its totient is φ = 598308000.

The previous prime is 1645348069. The next prime is 1645348123. The reversal of 1645348100 is 18435461.

It is a super-2 number, since 2×1645348100² = 5414340740347220000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 746786 + ... + 748985.

Almost surely, 2^1645348100 is an apocalyptic number.

1645348100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1645348100 is an abundant number, since it is smaller than the sum of its proper divisors (2249642188).

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

1645348100 is a wasteful number, since it uses less digits than its factorization.

1645348100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1495796 (or 1495789 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 1645348100 is about 40562.8906760847. The cubic root of 1645348100 is about 1180.5542019905.

The spelling of 1645348100 in words is "one billion, six hundred forty-five million, three hundred forty-eight thousand, one hundred".