7721985747 has 16 divisors (see below), whose sum is σ = 11777077760. Its totient is φ = 4408722432.

The previous prime is 7721985727. The next prime is 7721985763. The reversal of 7721985747 is 7475891277.

It is not a de Polignac number, because 7721985747 - 2⁷ = 7721985619 is a prime.

It is a super-2 number, since 2×7721985747² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7721985727) 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, 135247 + ... + 183672.

It is an arithmetic number, because the mean of its divisors is an integer number (736067360).

Almost surely, 2^7721985747 is an apocalyptic number.

7721985747 is a deficient number, since it is larger than the sum of its proper divisors (4055092013).

7721985747 is a wasteful number, since it uses less digits than its factorization.

7721985747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320082.

The product of its digits is 6914880, while the sum is 57.

The square root of 7721985747 is about 87874.8299969906. The cubic root of 7721985747 is about 1976.5584662692.

The spelling of 7721985747 in words is "seven billion, seven hundred twenty-one million, nine hundred eighty-five thousand, seven hundred forty-seven".