655814780 has 48 divisors (see below), whose sum is σ = 1464765120. Its totient is φ = 245787648.

The previous prime is 655814779. The next prime is 655814813. The reversal of 655814780 is 87418556.

It is a happy number.

It is a congruent number.

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, 73649 + ... + 82071.

It is an arithmetic number, because the mean of its divisors is an integer number (30515940).

Almost surely, 2^655814780 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 655814780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (732382560).

655814780 is an abundant number, since it is smaller than the sum of its proper divisors (808950340).

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

655814780 is a wasteful number, since it uses less digits than its factorization.

655814780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8678 (or 8676 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 44.

The square root of 655814780 is about 25608.8808814442. The cubic root of 655814780 is about 868.8145125393.

The spelling of 655814780 in words is "six hundred fifty-five million, eight hundred fourteen thousand, seven hundred eighty".