783728408721 has 8 divisors (see below), whose sum is σ = 1045473368544. Its totient is φ = 522234527360.

The previous prime is 783728408653. The next prime is 783728408741. The reversal of 783728408721 is 127804827387.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 783728408721 - 2²⁵ = 783694854289 is a prime.

It is a super-2 number, since 2×783728408721² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (783728408741) 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, 62762331 + ... + 62774816.

It is an arithmetic number, because the mean of its divisors is an integer number (130684171068).

Almost surely, 2^783728408721 is an apocalyptic number.

It is an amenable number.

783728408721 is a deficient number, since it is larger than the sum of its proper divisors (261744959823).

783728408721 is a wasteful number, since it uses less digits than its factorization.

783728408721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125539231.

The product of its (nonzero) digits is 8429568, while the sum is 57.

The spelling of 783728408721 in words is "seven hundred eighty-three billion, seven hundred twenty-eight million, four hundred eight thousand, seven hundred twenty-one".