1328909690 has 16 divisors (see below), whose sum is σ = 2392761600. Its totient is φ = 531402960.

The previous prime is 1328909689. The next prime is 1328909713. The reversal of 1328909690 is 969098231.

It is a super-2 number, since 2×1328909690² = 3532001928351792200, which contains 22 as substring.

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, 18011 + ... + 54609.

It is an arithmetic number, because the mean of its divisors is an integer number (149547600).

Almost surely, 2^1328909690 is an apocalyptic number.

1328909690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1328909690 is a deficient number, since it is larger than the sum of its proper divisors (1063851910).

1328909690 is a wasteful number, since it uses less digits than its factorization.

1328909690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40237.

The product of its (nonzero) digits is 209952, while the sum is 47.

The square root of 1328909690 is about 36454.2136110491. The cubic root of 1328909690 is about 1099.4238553114.

The spelling of 1328909690 in words is "one billion, three hundred twenty-eight million, nine hundred nine thousand, six hundred ninety".