7748896721 has 16 divisors (see below), whose sum is σ = 8185701888. Its totient is φ = 7327027200.

The previous prime is 7748896703. The next prime is 7748896723. The reversal of 7748896721 is 1276988477.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7748896721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7748896723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 178961 + ... + 218001.

It is an arithmetic number, because the mean of its divisors is an integer number (511606368).

Almost surely, 2^7748896721 is an apocalyptic number.

It is an amenable number.

7748896721 is a deficient number, since it is larger than the sum of its proper divisors (436805167).

7748896721 is a wasteful number, since it uses less digits than its factorization.

7748896721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39232.

The product of its digits is 9483264, while the sum is 59.

The square root of 7748896721 is about 88027.8178816219. The cubic root of 7748896721 is about 1978.8518937451.

The spelling of 7748896721 in words is "seven billion, seven hundred forty-eight million, eight hundred ninety-six thousand, seven hundred twenty-one".