689378540 has 24 divisors (see below), whose sum is σ = 1510639200. Its totient is φ = 263762048.

The previous prime is 689378497. The next prime is 689378549. The reversal of 689378540 is 45873986.

It is not an unprimeable number, because it can be changed into a prime (689378549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 748865 + ... + 749784.

It is an arithmetic number, because the mean of its divisors is an integer number (62943300).

Almost surely, 2^689378540 is an apocalyptic number.

It is an amenable number.

689378540 is an abundant number, since it is smaller than the sum of its proper divisors (821260660).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

689378540 is a wasteful number, since it uses less digits than its factorization.

689378540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1498681 (or 1498679 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 50.

The square root of 689378540 is about 26256.0191194324. The cubic root of 689378540 is about 883.3902195080.

It can be divided in two parts, 68937 and 8540, that added together give a palindrome (77477).

The spelling of 689378540 in words is "six hundred eighty-nine million, three hundred seventy-eight thousand, five hundred forty".