646321470 has 32 divisors (see below), whose sum is σ = 1642418208. Its totient is φ = 162213888.

The previous prime is 646321469. The next prime is 646321477. The reversal of 646321470 is 74123646.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646321477) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 633139 + ... + 634158.

It is an arithmetic number, because the mean of its divisors is an integer number (51325569).

Almost surely, 2^646321470 is an apocalyptic number.

646321470 is an abundant number, since it is smaller than the sum of its proper divisors (996096738).

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

646321470 is a wasteful number, since it uses less digits than its factorization.

646321470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1267324.

The product of its (nonzero) digits is 24192, while the sum is 33.

The square root of 646321470 is about 25422.8533017047. The cubic root of 646321470 is about 864.6019173528.

The spelling of 646321470 in words is "six hundred forty-six million, three hundred twenty-one thousand, four hundred seventy".