654563640 has 128 divisors (see below), whose sum is σ = 2042496000. Its totient is φ = 167612928.

The previous prime is 654563627. The next prime is 654563653. The reversal of 654563640 is 46365456.

It is an interprime number because it is at equal distance from previous prime (654563627) and next prime (654563653).

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, 831327 + ... + 832113.

It is an arithmetic number, because the mean of its divisors is an integer number (15957000).

Almost surely, 2^654563640 is an apocalyptic number.

654563640 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 654563640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1021248000).

654563640 is an abundant number, since it is smaller than the sum of its proper divisors (1387932360).

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

654563640 is a wasteful number, since it uses less digits than its factorization.

654563640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1069 (or 1065 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 39.

The square root of 654563640 is about 25584.4413657989. The cubic root of 654563640 is about 868.2616630620.

It can be divided in two parts, 65456 and 3640, that added together give a palindrome (69096).

The spelling of 654563640 in words is "six hundred fifty-four million, five hundred sixty-three thousand, six hundred forty".