655739520 has 128 divisors (see below), whose sum is σ = 2100384000. Its totient is φ = 174010368.

The previous prime is 655739489. The next prime is 655739573. The reversal of 655739520 is 25937556.

It is a tau number, because it is divible by the number of its divisors (128).

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, 458166 + ... + 459594.

It is an arithmetic number, because the mean of its divisors is an integer number (16409250).

Almost surely, 2^655739520 is an apocalyptic number.

655739520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 655739520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1050192000).

655739520 is an abundant number, since it is smaller than the sum of its proper divisors (1444644480).

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

655739520 is a wasteful number, since it uses less digits than its factorization.

655739520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1690 (or 1678 counting only the distinct ones).

The product of its (nonzero) digits is 283500, while the sum is 42.

The square root of 655739520 is about 25607.4114271630. The cubic root of 655739520 is about 868.7812767926.

The spelling of 655739520 in words is "six hundred fifty-five million, seven hundred thirty-nine thousand, five hundred twenty".