654659980 has 48 divisors (see below), whose sum is σ = 1491426720. Its totient is φ = 239943168.

The previous prime is 654659939. The next prime is 654659983. The reversal of 654659980 is 89956456.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is not an unprimeable number, because it can be changed into a prime (654659983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26431 + ... + 44809.

It is an arithmetic number, because the mean of its divisors is an integer number (31071390).

Almost surely, 2^654659980 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 654659980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (745713360).

654659980 is an abundant number, since it is smaller than the sum of its proper divisors (836766740).

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

654659980 is a wasteful number, since it uses less digits than its factorization.

654659980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18538 (or 18536 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 52.

The square root of 654659980 is about 25586.3240814307. The cubic root of 654659980 is about 868.3042584747.

The spelling of 654659980 in words is "six hundred fifty-four million, six hundred fifty-nine thousand, nine hundred eighty".