1690044785 has 48 divisors (see below), whose sum is σ = 2411840448. Its totient is φ = 1126944000.

The previous prime is 1690044779. The next prime is 1690044787. The reversal of 1690044785 is 5874400961.

It is a de Polignac number, because none of the positive numbers 2^k-1690044785 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1690044787) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1607510 + ... + 1608560.

It is an arithmetic number, because the mean of its divisors is an integer number (50246676).

Almost surely, 2^1690044785 is an apocalyptic number.

It is an amenable number.

1690044785 is a deficient number, since it is larger than the sum of its proper divisors (721795663).

1690044785 is a wasteful number, since it uses less digits than its factorization.

1690044785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1266 (or 1253 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 44.

The square root of 1690044785 is about 41110.1542809073. The cubic root of 1690044785 is about 1191.1489468262.

The spelling of 1690044785 in words is "one billion, six hundred ninety million, forty-four thousand, seven hundred eighty-five".