1645048800 has 108 divisors (see below), whose sum is σ = 5800878720. Its totient is φ = 438677760.

The previous prime is 1645048799. The next prime is 1645048831. The reversal of 1645048800 is 88405461.

1645048800 is a `hidden beast` number, since 1 + 645 + 0 + 4 + 8 + 8 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 107040 + ... + 121439.

It is an arithmetic number, because the mean of its divisors is an integer number (53711840).

Almost surely, 2^1645048800 is an apocalyptic number.

1645048800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1645048800 is an abundant number, since it is smaller than the sum of its proper divisors (4155829920).

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

1645048800 is a wasteful number, since it uses less digits than its factorization.

1645048800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228505 (or 228489 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 1645048800 is about 40559.2011755656. The cubic root of 1645048800 is about 1180.4826140390.

The spelling of 1645048800 in words is "one billion, six hundred forty-five million, forty-eight thousand, eight hundred".