764721361887 has 32 divisors (see below), whose sum is σ = 1174951872000. Its totient is φ = 433366606848.

The previous prime is 764721361883. The next prime is 764721361939. The reversal of 764721361887 is 788163127467.

It is not a de Polignac number, because 764721361887 - 2² = 764721361883 is a prime.

It is a super-2 number, since 2×764721361887² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 764721361887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (764721361883) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2801239 + ... + 3062087.

It is an arithmetic number, because the mean of its divisors is an integer number (36717246000).

Almost surely, 2^764721361887 is an apocalyptic number.

764721361887 is a deficient number, since it is larger than the sum of its proper divisors (410230510113).

764721361887 is a wasteful number, since it uses less digits than its factorization.

764721361887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262015.

The product of its digits is 18966528, while the sum is 60.

The spelling of 764721361887 in words is "seven hundred sixty-four billion, seven hundred twenty-one million, three hundred sixty-one thousand, eight hundred eighty-seven".