655611840 has 336 divisors, whose sum is σ = 2510028000. Its totient is φ = 161021952.

The previous prime is 655611779. The next prime is 655611871. The reversal of 655611840 is 48116556.

655611840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 = 655611795 and 655611804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1459936 + ... + 1460384.

Almost surely, 2^655611840 is an apocalyptic number.

655611840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 655611840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1255014000).

655611840 is an abundant number, since it is smaller than the sum of its proper divisors (1854416160).

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

655611840 is a wasteful number, since it uses less digits than its factorization.

655611840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501 (or 472 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 655611840 is about 25604.9182775497. The cubic root of 655611840 is about 868.7248859086.

The spelling of 655611840 in words is "six hundred fifty-five million, six hundred eleven thousand, eight hundred forty".