7828211668 has 6 divisors (see below), whose sum is σ = 13699370426. Its totient is φ = 3914105832.

The previous prime is 7828211609. The next prime is 7828211711. The reversal of 7828211668 is 8661128287.

It can be written as a sum of positive squares in only one way, i.e., 4389327504 + 3438884164 = 66252^2 + 58642^2 .

It is a super-2 number, since 2×7828211668² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 978526455 + ... + 978526462.

Almost surely, 2^7828211668 is an apocalyptic number.

It is an amenable number.

7828211668 is a deficient number, since it is larger than the sum of its proper divisors (5871158758).

7828211668 is a wasteful number, since it uses less digits than its factorization.

7828211668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1957052921 (or 1957052919 counting only the distinct ones).

The product of its digits is 516096, while the sum is 49.

The square root of 7828211668 is about 88477.1816232864. The cubic root of 7828211668 is about 1985.5805958986.

The spelling of 7828211668 in words is "seven billion, eight hundred twenty-eight million, two hundred eleven thousand, six hundred sixty-eight".