4245644638 has 8 divisors (see below), whose sum is σ = 6385820832. Its totient is φ = 2117037696.

The previous prime is 4245644621. The next prime is 4245644759. The reversal of 4245644638 is 8364465424.

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

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, 2891395 + ... + 2892862.

It is an arithmetic number, because the mean of its divisors is an integer number (798227604).

Almost surely, 2^4245644638 is an apocalyptic number.

4245644638 is a deficient number, since it is larger than the sum of its proper divisors (2140176194).

4245644638 is a wasteful number, since it uses less digits than its factorization.

4245644638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5784626.

The product of its digits is 2211840, while the sum is 46.

The square root of 4245644638 is about 65158.6113879048. The cubic root of 4245644638 is about 1619.2523906503.

The spelling of 4245644638 in words is "four billion, two hundred forty-five million, six hundred forty-four thousand, six hundred thirty-eight".