655456440 has 32 divisors (see below), whose sum is σ = 1966369680. Its totient is φ = 174788352.

The previous prime is 655456409. The next prime is 655456453. The reversal of 655456440 is 44654556.

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, 2730949 + ... + 2731188.

Almost surely, 2^655456440 is an apocalyptic number.

655456440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

655456440 is an abundant number, since it is smaller than the sum of its proper divisors (1310913240).

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

655456440 is a wasteful number, since it uses less digits than its factorization.

655456440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5462151 (or 5462147 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 39.

The square root of 655456440 is about 25601.8835244597. The cubic root of 655456440 is about 868.6562423877.

The spelling of 655456440 in words is "six hundred fifty-five million, four hundred fifty-six thousand, four hundred forty".