654399720 has 192 divisors, whose sum is σ = 2325697920. Its totient is φ = 158602752.

The previous prime is 654399719. The next prime is 654399721. The reversal of 654399720 is 27993456.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (654399719) and next prime (654399721).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (654399721) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 312517 + ... + 314603.

It is an arithmetic number, because the mean of its divisors is an integer number (12113010).

Almost surely, 2^654399720 is an apocalyptic number.

654399720 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 654399720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1162848960).

654399720 is an abundant number, since it is smaller than the sum of its proper divisors (1671298200).

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

654399720 is a wasteful number, since it uses less digits than its factorization.

654399720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2184 (or 2177 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 45.

The square root of 654399720 is about 25581.2376557507. The cubic root of 654399720 is about 868.1891784706.

The spelling of 654399720 in words is "six hundred fifty-four million, three hundred ninety-nine thousand, seven hundred twenty".