645202406 has 8 divisors (see below), whose sum is σ = 984207240. Its totient is φ = 317133328.

The previous prime is 645202391. The next prime is 645202423. The reversal of 645202406 is 604202546.

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

It is a super-2 number, since 2×645202406² = 832572289416377672, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2733791 + ... + 2734026.

It is an arithmetic number, because the mean of its divisors is an integer number (123025905).

Almost surely, 2^645202406 is an apocalyptic number.

645202406 is a deficient number, since it is larger than the sum of its proper divisors (339004834).

645202406 is a wasteful number, since it uses less digits than its factorization.

645202406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5467878.

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 645202406 is about 25400.8347500628. The cubic root of 645202406 is about 864.1026282340.

The spelling of 645202406 in words is "six hundred forty-five million, two hundred two thousand, four hundred six".