646994074 has 8 divisors (see below), whose sum is σ = 980496468. Its totient is φ = 320161920.

The previous prime is 646994069. The next prime is 646994081. The reversal of 646994074 is 470499646.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 645414025 + 1580049 = 25405^2 + 1257^2 .

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

It is a super-2 number, since 2×646994074² = 837202663582234952, which contains 22 as substring.

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, 1667317 + ... + 1667704.

Almost surely, 2^646994074 is an apocalyptic number.

646994074 is a deficient number, since it is larger than the sum of its proper divisors (333502394).

646994074 is a wasteful number, since it uses less digits than its factorization.

646994074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3335120.

The product of its (nonzero) digits is 1306368, while the sum is 49.

The square root of 646994074 is about 25436.0781961371. The cubic root of 646994074 is about 864.9017336331.

The spelling of 646994074 in words is "six hundred forty-six million, nine hundred ninety-four thousand, seventy-four".