7721985746 has 8 divisors (see below), whose sum is σ = 11584257660. Its totient is φ = 3860566528.

The previous prime is 7721985727. The next prime is 7721985763. The reversal of 7721985746 is 6475891277.

It can be written as a sum of positive squares in 2 ways, for example, as 5884577521 + 1837408225 = 76711^2 + 42865^2 .

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

It is a super-2 number, since 2×7721985746² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7721985691 and 7721985700.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190031 + ... + 227058.

Almost surely, 2^7721985746 is an apocalyptic number.

7721985746 is a deficient number, since it is larger than the sum of its proper divisors (3862271914).

7721985746 is a wasteful number, since it uses less digits than its factorization.

7721985746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426348.

The product of its digits is 5927040, while the sum is 56.

The square root of 7721985746 is about 87874.8299913007. The cubic root of 7721985746 is about 1976.5584661838.

The spelling of 7721985746 in words is "seven billion, seven hundred twenty-one million, nine hundred eighty-five thousand, seven hundred forty-six".