1690134778 has 8 divisors (see below), whose sum is σ = 2668633920. Its totient is φ = 800590140.

The previous prime is 1690134751. The next prime is 1690134779. The reversal of 1690134778 is 8774310961.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1690134779) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22238578 + ... + 22238653.

It is an arithmetic number, because the mean of its divisors is an integer number (333579240).

Almost surely, 2^1690134778 is an apocalyptic number.

1690134778 is a deficient number, since it is larger than the sum of its proper divisors (978499142).

1690134778 is a wasteful number, since it uses less digits than its factorization.

1690134778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44477252.

The product of its (nonzero) digits is 254016, while the sum is 46.

The square root of 1690134778 is about 41111.2488012709. The cubic root of 1690134778 is about 1191.1700889020.

The spelling of 1690134778 in words is "one billion, six hundred ninety million, one hundred thirty-four thousand, seven hundred seventy-eight".