864643401 has 6 divisors (see below), whose sum is σ = 1248929370. Its totient is φ = 576428928.

The previous prime is 864643397. The next prime is 864643433. The reversal of 864643401 is 104346468.

864643401 is a `hidden beast` number, since 8 + 6 + 4 + 643 + 4 + 0 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 517790025 + 346853376 = 22755^2 + 18624^2 .

It is not a de Polignac number, because 864643401 - 2² = 864643397 is a prime.

It is not an unprimeable number, because it can be changed into a prime (864643471) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 48035736 + ... + 48035753.

It is an arithmetic number, because the mean of its divisors is an integer number (208154895).

Almost surely, 2^864643401 is an apocalyptic number.

It is an amenable number.

864643401 is a deficient number, since it is larger than the sum of its proper divisors (384285969).

864643401 is a wasteful number, since it uses less digits than its factorization.

864643401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96071495 (or 96071492 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 36.

The square root of 864643401 is about 29404.8193498957. The cubic root of 864643401 is about 952.6769927567.

Adding to 864643401 its reverse (104346468), we get a palindrome (968989869).

The spelling of 864643401 in words is "eight hundred sixty-four million, six hundred forty-three thousand, four hundred one".