646694435 has 8 divisors (see below), whose sum is σ = 794961216. Its totient is φ = 504736960.

The previous prime is 646694387. The next prime is 646694459. The reversal of 646694435 is 534496646.

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

It is a de Polignac number, because none of the positive numbers 2^k-646694435 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 646694435.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1577099 + ... + 1577508.

It is an arithmetic number, because the mean of its divisors is an integer number (99370152).

Almost surely, 2^646694435 is an apocalyptic number.

646694435 is a deficient number, since it is larger than the sum of its proper divisors (148266781).

646694435 is a wasteful number, since it uses less digits than its factorization.

646694435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3154653.

The product of its digits is 1866240, while the sum is 47.

The square root of 646694435 is about 25430.1874747317. The cubic root of 646694435 is about 864.7681938688.

The spelling of 646694435 in words is "six hundred forty-six million, six hundred ninety-four thousand, four hundred thirty-five".