1645112040 has 128 divisors (see below), whose sum is σ = 5798217600. Its totient is φ = 368133120.

The previous prime is 1645112033. The next prime is 1645112059. The reversal of 1645112040 is 402115461.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1645112040.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30775 + ... + 65094.

It is an arithmetic number, because the mean of its divisors is an integer number (45298575).

Almost surely, 2^1645112040 is an apocalyptic number.

1645112040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1645112040 is an abundant number, since it is smaller than the sum of its proper divisors (4153105560).

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

1645112040 is a wasteful number, since it uses less digits than its factorization.

1645112040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95907 (or 95903 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 1645112040 is about 40559.9807692262. The cubic root of 1645112040 is about 1180.4977407968.

The spelling of 1645112040 in words is "one billion, six hundred forty-five million, one hundred twelve thousand, forty".