646512406 has 8 divisors (see below), whose sum is σ = 971929800. Its totient is φ = 322535808.

The previous prime is 646512331. The next prime is 646512407. The reversal of 646512406 is 604215646.

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

It is a super-2 number, since 2×646512406² = 835956582223817672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646512407) 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, 359076 + ... + 360871.

It is an arithmetic number, because the mean of its divisors is an integer number (121491225).

Almost surely, 2^646512406 is an apocalyptic number.

646512406 is a deficient number, since it is larger than the sum of its proper divisors (325417394).

646512406 is a wasteful number, since it uses less digits than its factorization.

646512406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720398.

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 646512406 is about 25426.6082283894. The cubic root of 646512406 is about 864.6870490743.

The spelling of 646512406 in words is "six hundred forty-six million, five hundred twelve thousand, four hundred six".