655243140 has 48 divisors (see below), whose sum is σ = 1879436160. Its totient is φ = 170469120.

The previous prime is 655243133. The next prime is 655243153. The reversal of 655243140 is 41342556.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 655243098 and 655243107.

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, 130720 + ... + 135639.

It is an arithmetic number, because the mean of its divisors is an integer number (39154920).

Almost surely, 2^655243140 is an apocalyptic number.

655243140 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

655243140 is an abundant number, since it is smaller than the sum of its proper divisors (1224193020).

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

655243140 is a wasteful number, since it uses less digits than its factorization.

655243140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266412 (or 266410 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 655243140 is about 25597.7174763689. The cubic root of 655243140 is about 868.5620055235.

Adding to 655243140 its reverse (41342556), we get a palindrome (696585696).

The spelling of 655243140 in words is "six hundred fifty-five million, two hundred forty-three thousand, one hundred forty".