7961728 has 16 divisors (see below), whose sum is σ = 15861510. Its totient is φ = 3980800.

The previous prime is 7961719. The next prime is 7961743. The reversal of 7961728 is 8271697.

It can be written as a sum of positive squares in only one way, i.e., 7795264 + 166464 = 2792^2 + 408^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a super-2 number, since 2×7961728² = 126778225491968, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30973 + ... + 31228.

Almost surely, 2^7961728 is an apocalyptic number.

It is an amenable number.

7961728 is a deficient number, since it is larger than the sum of its proper divisors (7899782).

7961728 is an equidigital number, since it uses as much as digits as its factorization.

7961728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62215 (or 62203 counting only the distinct ones).

The product of its digits is 42336, while the sum is 40.

The square root of 7961728 is about 2821.6534159957. The cubic root of 7961728 is about 199.6805567183.

The spelling of 7961728 in words is "seven million, nine hundred sixty-one thousand, seven hundred twenty-eight".