646201974 has 64 divisors (see below), whose sum is σ = 1481587200. Its totient is φ = 185982720.

The previous prime is 646201973. The next prime is 646201981. The reversal of 646201974 is 479102646.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646201973) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 224754 + ... + 227610.

It is an arithmetic number, because the mean of its divisors is an integer number (23149800).

Almost surely, 2^646201974 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646201974, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (740793600).

646201974 is an abundant number, since it is smaller than the sum of its proper divisors (835385226).

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

646201974 is a wasteful number, since it uses less digits than its factorization.

646201974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3045.

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 646201974 is about 25420.5030241339. The cubic root of 646201974 is about 864.5486297122.

The spelling of 646201974 in words is "six hundred forty-six million, two hundred one thousand, nine hundred seventy-four".