646968642 has 8 divisors (see below), whose sum is σ = 1293937296. Its totient is φ = 215656212.

The previous prime is 646968631. The next prime is 646968653. The reversal of 646968642 is 246869646.

It is an interprime number because it is at equal distance from previous prime (646968631) and next prime (646968653).

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

646968642 is an admirable 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, 53914048 + ... + 53914059.

It is an arithmetic number, because the mean of its divisors is an integer number (161742162).

Almost surely, 2^646968642 is an apocalyptic number.

646968642 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646968642 is a wasteful number, since it uses less digits than its factorization.

646968642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107828112.

The product of its digits is 2985984, while the sum is 51.

The square root of 646968642 is about 25435.5782713899. The cubic root of 646968642 is about 864.8904009847.

The spelling of 646968642 in words is "six hundred forty-six million, nine hundred sixty-eight thousand, six hundred forty-two".