1689557690 has 32 divisors (see below), whose sum is σ = 3282871680. Its totient is φ = 624145984.

The previous prime is 1689557659. The next prime is 1689557717. The reversal of 1689557690 is 967559861.

It is a super-2 number, since 2×1689557690² = 5709210375676272200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119984 + ... + 133323.

It is an arithmetic number, because the mean of its divisors is an integer number (102589740).

Almost surely, 2^1689557690 is an apocalyptic number.

1689557690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1689557690 is a deficient number, since it is larger than the sum of its proper divisors (1593313990).

1689557690 is a wasteful number, since it uses less digits than its factorization.

1689557690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253366.

The product of its (nonzero) digits is 4082400, while the sum is 56.

The square root of 1689557690 is about 41104.2295877200. The cubic root of 1689557690 is about 1191.0345004614.

The spelling of 1689557690 in words is "one billion, six hundred eighty-nine million, five hundred fifty-seven thousand, six hundred ninety".