7406728661 has 16 divisors (see below), whose sum is σ = 7817871360. Its totient is φ = 7008122160.

The previous prime is 7406728643. The next prime is 7406728699. The reversal of 7406728661 is 1668276047.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 7406728661 - 2¹⁴ = 7406712277 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7406728601) 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, 237566 + ... + 266928.

It is an arithmetic number, because the mean of its divisors is an integer number (488616960).

Almost surely, 2^7406728661 is an apocalyptic number.

It is an amenable number.

7406728661 is a deficient number, since it is larger than the sum of its proper divisors (411142699).

7406728661 is a wasteful number, since it uses less digits than its factorization.

7406728661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29576.

The product of its (nonzero) digits is 677376, while the sum is 47.

The square root of 7406728661 is about 86062.3533317559. The cubic root of 7406728661 is about 1949.2856169939.

The spelling of 7406728661 in words is "seven billion, four hundred six million, seven hundred twenty-eight thousand, six hundred sixty-one".