7128063621 has 24 divisors (see below), whose sum is σ = 11770274880. Its totient is φ = 4072032576.

The previous prime is 7128063589. The next prime is 7128063643. The reversal of 7128063621 is 1263608217.

7128063621 is a `hidden beast` number, since 7 + 1 + 28 + 0 + 6 + 3 + 621 = 666.

It is not a de Polignac number, because 7128063621 - 2⁵ = 7128063589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7128061621) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 242710 + ... + 270488.

It is an arithmetic number, because the mean of its divisors is an integer number (490428120).

Almost surely, 2^7128063621 is an apocalyptic number.

It is an amenable number.

7128063621 is a deficient number, since it is larger than the sum of its proper divisors (4642211259).

7128063621 is a wasteful number, since it uses less digits than its factorization.

7128063621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31865 (or 31862 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 7128063621 is about 84427.8604549470. The cubic root of 7128063621 is about 1924.5263237532.

The spelling of 7128063621 in words is "seven billion, one hundred twenty-eight million, sixty-three thousand, six hundred twenty-one".