1801642640 has 40 divisors (see below), whose sum is σ = 4787223360. Its totient is φ = 617705856.

The previous prime is 1801642639. The next prime is 1801642649. The reversal of 1801642640 is 462461081.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 1801642597 and 1801642606.

It is not an unprimeable number, because it can be changed into a prime (1801642649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1608050 + ... + 1609169.

It is an arithmetic number, because the mean of its divisors is an integer number (119680584).

Almost surely, 2^1801642640 is an apocalyptic number.

1801642640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1801642640 is an abundant number, since it is smaller than the sum of its proper divisors (2985580720).

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

1801642640 is a wasteful number, since it uses less digits than its factorization.

1801642640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3217239 (or 3217233 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 1801642640 is about 42445.7611546783. The cubic root of 1801642640 is about 1216.8103187694.

The spelling of 1801642640 in words is "one billion, eight hundred one million, six hundred forty-two thousand, six hundred forty".