646402433 has 4 divisors (see below), whose sum is σ = 662168388. Its totient is φ = 630636480.

The previous prime is 646402429. The next prime is 646402447. The reversal of 646402433 is 334204646.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 278990209 + 367412224 = 16703^2 + 19168^2 .

It is a cyclic number.

It is not a de Polignac number, because 646402433 - 2² = 646402429 is a prime.

It is a super-2 number, since 2×646402433² = 835672210776638978, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 646402433.

It is not an unprimeable number, because it can be changed into a prime (646402453) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7882916 + ... + 7882997.

It is an arithmetic number, because the mean of its divisors is an integer number (165542097).

Almost surely, 2^646402433 is an apocalyptic number.

It is an amenable number.

646402433 is a deficient number, since it is larger than the sum of its proper divisors (15765955).

646402433 is a wasteful number, since it uses less digits than its factorization.

646402433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15765954.

The product of its (nonzero) digits is 41472, while the sum is 32.

The square root of 646402433 is about 25424.4455790092. The cubic root of 646402433 is about 864.6380179857.

The spelling of 646402433 in words is "six hundred forty-six million, four hundred two thousand, four hundred thirty-three".