1645463040 has 160 divisors (see below), whose sum is σ = 5665324896. Its totient is φ = 405012480.

The previous prime is 1645462993. The next prime is 1645463051. The reversal of 1645463040 is 403645461.

It is a tau number, because it is divible by the number of its divisors (160).

It is a junction number, because it is equal to n+sod(n) for n = 1645462992 and 1645463010.

It is a congruent number.

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, 91600 + ... + 108080.

Almost surely, 2^1645463040 is an apocalyptic number.

1645463040 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 1645463040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2832662448).

1645463040 is an abundant number, since it is smaller than the sum of its proper divisors (4019861856).

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

1645463040 is a wasteful number, since it uses less digits than its factorization.

1645463040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16520 (or 16504 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 1645463040 is about 40564.3074635818. The cubic root of 1645463040 is about 1180.5816915615.

The spelling of 1645463040 in words is "one billion, six hundred forty-five million, four hundred sixty-three thousand, forty".