1629720768 has 56 divisors (see below), whose sum is σ = 4643666608. Its totient is φ = 501451776.

The previous prime is 1629720761. The next prime is 1629720779. The reversal of 1629720768 is 8670279261.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (1629720761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 323971 + ... + 328962.

It is an arithmetic number, because the mean of its divisors is an integer number (82922618).

Almost surely, 2^1629720768 is an apocalyptic number.

It is an amenable number.

1629720768 is an abundant number, since it is smaller than the sum of its proper divisors (3013945840).

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

1629720768 is a wasteful number, since it uses less digits than its factorization.

1629720768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652961 (or 652951 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 48.

The square root of 1629720768 is about 40369.8001976725. The cubic root of 1629720768 is about 1176.8047155463.

The spelling of 1629720768 in words is "one billion, six hundred twenty-nine million, seven hundred twenty thousand, seven hundred sixty-eight".