689546640 has 80 divisors (see below), whose sum is σ = 2206573056. Its totient is φ = 177945600.

The previous prime is 689546621. The next prime is 689546657. The reversal of 689546640 is 46645986.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 689546640.

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, 38901 + ... + 53780.

Almost surely, 2^689546640 is an apocalyptic number.

689546640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

689546640 is an abundant number, since it is smaller than the sum of its proper divisors (1517026416).

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

689546640 is a wasteful number, since it uses less digits than its factorization.

689546640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92728 (or 92722 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 48.

The square root of 689546640 is about 26259.2200950447. The cubic root of 689546640 is about 883.4620164570.

It can be divided in two parts, 6895 and 46640, that added together give a palindrome (53535).

The spelling of 689546640 in words is "six hundred eighty-nine million, five hundred forty-six thousand, six hundred forty".