654664640 has 224 divisors, whose sum is σ = 1892588544. Its totient is φ = 210862080.

The previous prime is 654664631. The next prime is 654664651. The reversal of 654664640 is 46466456.

It is a tau number, because it is divible by the number of its divisors (224).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4997375 + ... + 4997505.

It is an arithmetic number, because the mean of its divisors is an integer number (8449056).

Almost surely, 2^654664640 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 654664640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (946294272).

654664640 is an abundant number, since it is smaller than the sum of its proper divisors (1237923904).

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

654664640 is a wasteful number, since it uses less digits than its factorization.

654664640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275 (or 265 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 41.

The square root of 654664640 is about 25586.4151455416. The cubic root of 654664640 is about 868.3063187240.

The spelling of 654664640 in words is "six hundred fifty-four million, six hundred sixty-four thousand, six hundred forty".