689784440 has 32 divisors (see below), whose sum is σ = 1554660000. Its totient is φ = 275443584.

The previous prime is 689784439. The next prime is 689784461. The reversal of 689784440 is 44487986.

It is a super-2 number, since 2×689784440² = 951605147332227200, which contains 22 as substring.

It is a congruent number.

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, 9566 + ... + 38354.

It is an arithmetic number, because the mean of its divisors is an integer number (48583125).

Almost surely, 2^689784440 is an apocalyptic number.

It is an amenable number.

689784440 is an abundant number, since it is smaller than the sum of its proper divisors (864875560).

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

689784440 is a wasteful number, since it uses less digits than its factorization.

689784440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29399 (or 29395 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 50.

The square root of 689784440 is about 26263.7476381418. The cubic root of 689784440 is about 883.5635629463.

The spelling of 689784440 in words is "six hundred eighty-nine million, seven hundred eighty-four thousand, four hundred forty".