655657040 has 20 divisors (see below), whose sum is σ = 1524402804. Its totient is φ = 262262784.

The previous prime is 655657033. The next prime is 655657043. The reversal of 655657040 is 40756556.

It can be written as a sum of positive squares in 2 ways, for example, as 414041104 + 241615936 = 20348^2 + 15544^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 655656985 and 655657003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655657043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4097777 + ... + 4097936.

Almost surely, 2^655657040 is an apocalyptic number.

It is an amenable number.

655657040 is an abundant number, since it is smaller than the sum of its proper divisors (868745764).

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

655657040 is a wasteful number, since it uses less digits than its factorization.

655657040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8195726 (or 8195720 counting only the distinct ones).

The product of its (nonzero) digits is 126000, while the sum is 38.

The square root of 655657040 is about 25605.8009052636. The cubic root of 655657040 is about 868.7448496839.

The spelling of 655657040 in words is "six hundred fifty-five million, six hundred fifty-seven thousand, forty".