655400440 has 32 divisors (see below), whose sum is σ = 1552266000. Its totient is φ = 248361984.

The previous prime is 655400437. The next prime is 655400441. The reversal of 655400440 is 44004556.

655400440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 655400399 and 655400408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655400441) 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, 430425 + ... + 431944.

Almost surely, 2^655400440 is an apocalyptic number.

It is an amenable number.

655400440 is an abundant number, since it is smaller than the sum of its proper divisors (896865560).

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

655400440 is a wasteful number, since it uses less digits than its factorization.

655400440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862399 (or 862395 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 28.

The square root of 655400440 is about 25600.7898315657. The cubic root of 655400440 is about 868.6315033245.

Adding to 655400440 its reverse (44004556), we get a palindrome (699404996).

The spelling of 655400440 in words is "six hundred fifty-five million, four hundred thousand, four hundred forty".