7721033228 has 24 divisors (see below), whose sum is σ = 13959120000. Its totient is φ = 3732917760.

The previous prime is 7721033219. The next prime is 7721033239. The reversal of 7721033228 is 8223301277.

It is a happy number.

It is a super-2 number, since 2×7721033228² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129950 + ... + 179802.

It is an arithmetic number, because the mean of its divisors is an integer number (581630000).

Almost surely, 2^7721033228 is an apocalyptic number.

It is an amenable number.

7721033228 is a deficient number, since it is larger than the sum of its proper divisors (6238086772).

7721033228 is a wasteful number, since it uses less digits than its factorization.

7721033228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51137 (or 51135 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 7721033228 is about 87869.4100810971. The cubic root of 7721033228 is about 1976.4771924029.

The spelling of 7721033228 in words is "seven billion, seven hundred twenty-one million, thirty-three thousand, two hundred twenty-eight".