655242840 has 96 divisors (see below), whose sum is σ = 2433768480. Its totient is φ = 149769216.

The previous prime is 655242829. The next prime is 655242899. The reversal of 655242840 is 48242556.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 655242795 and 655242804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 127489 + ... + 132528.

It is an arithmetic number, because the mean of its divisors is an integer number (25351755).

Almost surely, 2^655242840 is an apocalyptic number.

655242840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

655242840 is an abundant number, since it is smaller than the sum of its proper divisors (1778525640).

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

655242840 is a wasteful number, since it uses less digits than its factorization.

655242840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260041 (or 260034 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 36.

The square root of 655242840 is about 25597.7116164707. The cubic root of 655242840 is about 868.5618729678.

The spelling of 655242840 in words is "six hundred fifty-five million, two hundred forty-two thousand, eight hundred forty".