646228801 has 4 divisors (see below), whose sum is σ = 649126912. Its totient is φ = 643330692.

The previous prime is 646228771. The next prime is 646228831. The reversal of 646228801 is 108822646.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (646228771) and next prime (646228831).

It is a cyclic number.

It is not a de Polignac number, because 646228801 - 2¹⁷ = 646097729 is a prime.

It is a super-2 number, since 2×646228801² = 835223326483795202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646228831) 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, 1448721 + ... + 1449166.

It is an arithmetic number, because the mean of its divisors is an integer number (162281728).

Almost surely, 2^646228801 is an apocalyptic number.

It is an amenable number.

646228801 is a deficient number, since it is larger than the sum of its proper divisors (2898111).

646228801 is a wasteful number, since it uses less digits than its factorization.

646228801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2898110.

The product of its (nonzero) digits is 36864, while the sum is 37.

The square root of 646228801 is about 25421.0306832748. The cubic root of 646228801 is about 864.5605934254.

The spelling of 646228801 in words is "six hundred forty-six million, two hundred twenty-eight thousand, eight hundred one".