1906689564 has 96 divisors (see below), whose sum is σ = 5507208000. Its totient is φ = 566431488.

The previous prime is 1906689557. The next prime is 1906689613. The reversal of 1906689564 is 4659866091.

It is a happy number.

1906689564 is a `hidden beast` number, since 19 + 0 + 6 + 68 + 9 + 564 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 1906689564.

It is a congruent number.

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, 17302 + ... + 64130.

It is an arithmetic number, because the mean of its divisors is an integer number (57366750).

Almost surely, 2^1906689564 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 1906689564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2753604000).

1906689564 is an abundant number, since it is smaller than the sum of its proper divisors (3600518436).

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

1906689564 is a wasteful number, since it uses less digits than its factorization.

1906689564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46884 (or 46876 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 54.

The square root of 1906689564 is about 43665.6565735590. The cubic root of 1906689564 is about 1240.0142133300.

The spelling of 1906689564 in words is "one billion, nine hundred six million, six hundred eighty-nine thousand, five hundred sixty-four".