768721920 has 88 divisors (see below), whose sum is σ = 2458758144. Its totient is φ = 204988416.

The previous prime is 768721913. The next prime is 768721951. The reversal of 768721920 is 29127867.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9664 + ... + 40383.

Almost surely, 2^768721920 is an apocalyptic number.

It is an amenable number.

768721920 is an abundant number, since it is smaller than the sum of its proper divisors (1690036224).

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

768721920 is a wasteful number, since it uses less digits than its factorization.

768721920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50075 (or 50057 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 42.

The square root of 768721920 is about 27725.8348837325. The cubic root of 768721920 is about 916.0582458847.

The spelling of 768721920 in words is "seven hundred sixty-eight million, seven hundred twenty-one thousand, nine hundred twenty".