655622140 has 48 divisors (see below), whose sum is σ = 1427025600. Its totient is φ = 252718592.

The previous prime is 655622117. The next prime is 655622141. The reversal of 655622140 is 41226556.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655622141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 496401 + ... + 497719.

It is an arithmetic number, because the mean of its divisors is an integer number (29729700).

Almost surely, 2^655622140 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 655622140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (713512800).

655622140 is an abundant number, since it is smaller than the sum of its proper divisors (771403460).

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

655622140 is a wasteful number, since it uses less digits than its factorization.

655622140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2214 (or 2212 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 655622140 is about 25605.1194099930. The cubic root of 655622140 is about 868.7294352567.

Adding to 655622140 its reverse (41226556), we get a palindrome (696848696).

The spelling of 655622140 in words is "six hundred fifty-five million, six hundred twenty-two thousand, one hundred forty".