1905640064 has 16 divisors (see below), whose sum is σ = 3796392570. Its totient is φ = 952819968.

The previous prime is 1905640057. The next prime is 1905640103. The reversal of 1905640064 is 4600465091.

It can be written as a sum of positive squares in only one way, i.e., 1208257600 + 697382464 = 34760^2 + 26408^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7443779 + ... + 7444034.

Almost surely, 2^1905640064 is an apocalyptic number.

It is an amenable number.

1905640064 is a deficient number, since it is larger than the sum of its proper divisors (1890752506).

1905640064 is an equidigital number, since it uses as much as digits as its factorization.

1905640064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14887827 (or 14887815 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 1905640064 is about 43653.6374658516. The cubic root of 1905640064 is about 1239.7866577121.

The spelling of 1905640064 in words is "one billion, nine hundred five million, six hundred forty thousand, sixty-four".