646342401 has 8 divisors (see below), whose sum is σ = 891506880. Its totient is φ = 416036432.

The previous prime is 646342379. The next prime is 646342427. The reversal of 646342401 is 104243646.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 646342401 - 2⁵ = 646342369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (646342451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3714525 + ... + 3714698.

It is an arithmetic number, because the mean of its divisors is an integer number (111438360).

Almost surely, 2^646342401 is an apocalyptic number.

It is an amenable number.

646342401 is a deficient number, since it is larger than the sum of its proper divisors (245164479).

646342401 is a wasteful number, since it uses less digits than its factorization.

646342401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7429255.

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 646342401 is about 25423.2649555481. The cubic root of 646342401 is about 864.6112505759.

The spelling of 646342401 in words is "six hundred forty-six million, three hundred forty-two thousand, four hundred one".