1645057408 has 64 divisors (see below), whose sum is σ = 3393515520. Its totient is φ = 793520640.

The previous prime is 1645057367. The next prime is 1645057417. The reversal of 1645057408 is 8047505461.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2408235 + ... + 2408917.

It is an arithmetic number, because the mean of its divisors is an integer number (53023680).

Almost surely, 2^1645057408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1645057408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1696757760).

1645057408 is an abundant number, since it is smaller than the sum of its proper divisors (1748458112).

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

1645057408 is an equidigital number, since it uses as much as digits as its factorization.

1645057408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1335 (or 1323 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 40.

The square root of 1645057408 is about 40559.3072919151. The cubic root of 1645057408 is about 1180.4846730614.

The spelling of 1645057408 in words is "one billion, six hundred forty-five million, fifty-seven thousand, four hundred eight".