646005900 has 72 divisors (see below), whose sum is σ = 1929432064. Its totient is φ = 166708800.

The previous prime is 646005889. The next prime is 646005901. The reversal of 646005900 is 9500646.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (646005901) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25432 + ... + 44031.

Almost surely, 2^646005900 is an apocalyptic number.

646005900 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

646005900 is an abundant number, since it is smaller than the sum of its proper divisors (1283426164).

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

646005900 is a wasteful number, since it uses less digits than its factorization.

646005900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69511 (or 69504 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 646005900 is about 25416.6461202103. The cubic root of 646005900 is about 864.4611789033.

It can be divided in two parts, 64600 and 5900, that added together give a triangular number (70500 = T₃₇₅).

The spelling of 646005900 in words is "six hundred forty-six million, five thousand, nine hundred".