1645924900 has 27 divisors (see below), whose sum is σ = 3572537619. Its totient is φ = 658207680.

The previous prime is 1645924877. The next prime is 1645924927. The reversal of 1645924900 is 94295461.

The square root of 1645924900 is 40570.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 27311076 + 1618613824 = 5226^2 + 40232^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 403672 + ... + 407728.

Almost surely, 2^1645924900 is an apocalyptic number.

1645924900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1645924900 is the 40570-th square number.

It is an amenable number.

1645924900 is an abundant number, since it is smaller than the sum of its proper divisors (1926612719).

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

1645924900 is an frugal number, since it uses more digits than its factorization.

1645924900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8128 (or 4064 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 40.

The cubic root of 1645924900 is about 1180.6921391860.

The spelling of 1645924900 in words is "one billion, six hundred forty-five million, nine hundred twenty-four thousand, nine hundred".