1890718644 has 24 divisors (see below), whose sum is σ = 4553989888. Its totient is φ = 609909120.

The previous prime is 1890718603. The next prime is 1890718651. The reversal of 1890718644 is 4468170981.

It is a junction number, because it is equal to n+sod(n) for n = 1890718593 and 1890718602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2540917 + ... + 2541660.

Almost surely, 2^1890718644 is an apocalyptic number.

It is an amenable number.

1890718644 is an abundant number, since it is smaller than the sum of its proper divisors (2663271244).

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

1890718644 is a wasteful number, since it uses less digits than its factorization.

1890718644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5082615 (or 5082613 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 48.

The square root of 1890718644 is about 43482.3946442695. The cubic root of 1890718644 is about 1236.5422757440.

The spelling of 1890718644 in words is "one billion, eight hundred ninety million, seven hundred eighteen thousand, six hundred forty-four".