1646225460 has 288 divisors, whose sum is σ = 5843964672. Its totient is φ = 371036160.

The previous prime is 1646225453. The next prime is 1646225461. The reversal of 1646225460 is 645226461.

1646225460 is a `hidden beast` number, since 1 + 646 + 2 + 2 + 5 + 4 + 6 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1646225461) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1684492 + ... + 1685468.

It is an arithmetic number, because the mean of its divisors is an integer number (20291544).

Almost surely, 2^1646225460 is an apocalyptic number.

1646225460 is a gapful number since it is divisible by the number (10) 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 1646225460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2921982336).

1646225460 is an abundant number, since it is smaller than the sum of its proper divisors (4197739212).

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

1646225460 is a wasteful number, since it uses less digits than its factorization.

1646225460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1063 (or 1058 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 1646225460 is about 40573.7040458472. The cubic root of 1646225460 is about 1180.7640029814.

The spelling of 1646225460 in words is "one billion, six hundred forty-six million, two hundred twenty-five thousand, four hundred sixty".