654991380 has 96 divisors (see below), whose sum is σ = 2042611200. Its totient is φ = 174248064.

The previous prime is 654991373. The next prime is 654991399. The reversal of 654991380 is 83199456.

It is a happy number.

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

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, 273669 + ... + 276051.

It is an arithmetic number, because the mean of its divisors is an integer number (21277200).

Almost surely, 2^654991380 is an apocalyptic number.

654991380 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 654991380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1021305600).

654991380 is an abundant number, since it is smaller than the sum of its proper divisors (1387619820).

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

654991380 is a wasteful number, since it uses less digits than its factorization.

654991380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2910 (or 2902 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 654991380 is about 25592.7993779500. The cubic root of 654991380 is about 868.4507505459.

The spelling of 654991380 in words is "six hundred fifty-four million, nine hundred ninety-one thousand, three hundred eighty".