757721664 has 84 divisors (see below), whose sum is σ = 2482153024. Its totient is φ = 216490752.

The previous prime is 757721651. The next prime is 757721681. The reversal of 757721664 is 466127757.

757721664 is a `hidden beast` number, since 7 + 577 + 2 + 16 + 64 = 666.

It is a tau number, because it is divible by the number of its divisors (84).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 89932 + ... + 97995.

Almost surely, 2^757721664 is an apocalyptic number.

It is an amenable number.

757721664 is an abundant number, since it is smaller than the sum of its proper divisors (1724431360).

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

757721664 is a wasteful number, since it uses less digits than its factorization.

757721664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187952 (or 187939 counting only the distinct ones).

The product of its digits is 493920, while the sum is 45.

The square root of 757721664 is about 27526.7445223731. The cubic root of 757721664 is about 911.6676998044.

It can be divided in two parts, 7577 and 21664, that added together give a square (29241 = 171²).

The spelling of 757721664 in words is "seven hundred fifty-seven million, seven hundred twenty-one thousand, six hundred sixty-four".