1646266860 has 144 divisors (see below), whose sum is σ = 5955296256. Its totient is φ = 359922816.

The previous prime is 1646266823. The next prime is 1646266871. The reversal of 1646266860 is 686626461.

1646266860 is a `hidden beast` number, since 16 + 4 + 626 + 6 + 8 + 6 + 0 = 666.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 577 + ... + 57383.

It is an arithmetic number, because the mean of its divisors is an integer number (41356224).

Almost surely, 2^1646266860 is an apocalyptic number.

1646266860 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 1646266860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2977648128).

1646266860 is an abundant number, since it is smaller than the sum of its proper divisors (4309029396).

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

1646266860 is a wasteful number, since it uses less digits than its factorization.

1646266860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56852 (or 56847 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 45.

The square root of 1646266860 is about 40574.2142252934. The cubic root of 1646266860 is about 1180.7739010222.

The spelling of 1646266860 in words is "one billion, six hundred forty-six million, two hundred sixty-six thousand, eight hundred sixty".