646453500 has 384 divisors, whose sum is σ = 2440488960. Its totient is φ = 129024000.

The previous prime is 646453477. The next prime is 646453513. The reversal of 646453500 is 5354646.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 3349404 + ... + 3349596.

It is an arithmetic number, because the mean of its divisors is an integer number (6355440).

Almost surely, 2^646453500 is an apocalyptic number.

646453500 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 646453500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1220244480).

646453500 is an abundant number, since it is smaller than the sum of its proper divisors (1794035460).

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

646453500 is a wasteful number, since it uses less digits than its factorization.

646453500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262 (or 250 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 33.

The square root of 646453500 is about 25425.4498485278. The cubic root of 646453500 is about 864.6607867258.

It can be divided in two parts, 646453 and 500, that added together give a triangular number (646953 = T₁₁₃₇).

The spelling of 646453500 in words is "six hundred forty-six million, four hundred fifty-three thousand, five hundred".