654172540 has 144 divisors (see below), whose sum is σ = 1681392384. Its totient is φ = 212889600.

The previous prime is 654172511. The next prime is 654172573. The reversal of 654172540 is 45271456.

It is a junction number, because it is equal to n+sod(n) for n = 654172496 and 654172505.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1853004 + ... + 1853356.

It is an arithmetic number, because the mean of its divisors is an integer number (11676336).

Almost surely, 2^654172540 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 654172540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (840696192).

654172540 is an abundant number, since it is smaller than the sum of its proper divisors (1027219844).

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

654172540 is a wasteful number, since it uses less digits than its factorization.

654172540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468 (or 459 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 34.

The square root of 654172540 is about 25576.7969065714. The cubic root of 654172540 is about 868.0887006128.

The spelling of 654172540 in words is "six hundred fifty-four million, one hundred seventy-two thousand, five hundred forty".