646155000 has 240 divisors, whose sum is σ = 2225943720. Its totient is φ = 169248000.

The previous prime is 646154953. The next prime is 646155007. The reversal of 646155000 is 551646.

It is a happy number.

646155000 is a `hidden beast` number, since 646 + 15 + 5 + 0 + 0 + 0 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646155007) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 3734914 + ... + 3735086.

Almost surely, 2^646155000 is an apocalyptic number.

646155000 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 646155000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1112971860).

646155000 is an abundant number, since it is smaller than the sum of its proper divisors (1579788720).

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

646155000 is a wasteful number, since it uses less digits than its factorization.

646155000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288 (or 266 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 646155000 is about 25419.5790681120. The cubic root of 646155000 is about 864.5276804873.

The spelling of 646155000 in words is "six hundred forty-six million, one hundred fifty-five thousand".