7661728 has 12 divisors (see below), whose sum is σ = 15084090. Its totient is φ = 3830848.

The previous prime is 7661723. The next prime is 7661741. The reversal of 7661728 is 8271667.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 7551504 + 110224 = 2748^2 + 332^2 .

It is not an unprimeable number, because it can be changed into a prime (7661723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119683 + ... + 119746.

Almost surely, 2^7661728 is an apocalyptic number.

It is an amenable number.

7661728 is a deficient number, since it is larger than the sum of its proper divisors (7422362).

7661728 is a wasteful number, since it uses less digits than its factorization.

7661728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239439 (or 239431 counting only the distinct ones).

The product of its digits is 28224, while the sum is 37.

The square root of 7661728 is about 2767.9826589052. The cubic root of 7661728 is about 197.1403742398.

The spelling of 7661728 in words is "seven million, six hundred sixty-one thousand, seven hundred twenty-eight".