655857780 has 24 divisors (see below), whose sum is σ = 1836401952. Its totient is φ = 174895392.

The previous prime is 655857749. The next prime is 655857781. The reversal of 655857780 is 87758556.

655857780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655857781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5465422 + ... + 5465541.

It is an arithmetic number, because the mean of its divisors is an integer number (76516748).

Almost surely, 2^655857780 is an apocalyptic number.

655857780 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

655857780 is an abundant number, since it is smaller than the sum of its proper divisors (1180544172).

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

655857780 is a wasteful number, since it uses less digits than its factorization.

655857780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10930975 (or 10930973 counting only the distinct ones).

The product of its (nonzero) digits is 2352000, while the sum is 51.

The square root of 655857780 is about 25609.7204201842. The cubic root of 655857780 is about 868.8335007296.

The spelling of 655857780 in words is "six hundred fifty-five million, eight hundred fifty-seven thousand, seven hundred eighty".