633649816 has 16 divisors (see below), whose sum is σ = 1239750000. Its totient is φ = 303049824.

The previous prime is 633649813. The next prime is 633649837. The reversal of 633649816 is 618946336.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (633649811) 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, 1721691 + ... + 1722058.

It is an arithmetic number, because the mean of its divisors is an integer number (77484375).

Almost surely, 2^633649816 is an apocalyptic number.

It is an amenable number.

633649816 is a deficient number, since it is larger than the sum of its proper divisors (606100184).

633649816 is a wasteful number, since it uses less digits than its factorization.

633649816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3443778 (or 3443774 counting only the distinct ones).

The product of its digits is 559872, while the sum is 46.

The square root of 633649816 is about 25172.4018718914. The cubic root of 633649816 is about 858.9141767753.

The spelling of 633649816 in words is "six hundred thirty-three million, six hundred forty-nine thousand, eight hundred sixteen".