655388140 has 48 divisors (see below), whose sum is σ = 1503177984. Its totient is φ = 238046400.

The previous prime is 655388119. The next prime is 655388177. The reversal of 655388140 is 41883556.

655388140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×655388140² = 859067228105319200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 655388093 and 655388102.

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, 357025 + ... + 358855.

It is an arithmetic number, because the mean of its divisors is an integer number (31316208).

Almost surely, 2^655388140 is an apocalyptic number.

It is an amenable number.

655388140 is an abundant number, since it is smaller than the sum of its proper divisors (847789844).

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

655388140 is a wasteful number, since it uses less digits than its factorization.

655388140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3478 (or 3476 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 40.

The square root of 655388140 is about 25600.5496034753. The cubic root of 655388140 is about 868.6260693772.

The spelling of 655388140 in words is "six hundred fifty-five million, three hundred eighty-eight thousand, one hundred forty".