1028620881 has 24 divisors (see below), whose sum is σ = 1571646336. Its totient is φ = 646937280.

The previous prime is 1028620877. The next prime is 1028620907. The reversal of 1028620881 is 1880268201.

1028620881 is a `hidden beast` number, since 1 + 0 + 28 + 620 + 8 + 8 + 1 = 666.

1028620881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1028620881 - 2² = 1028620877 is a prime.

It is a super-2 number, since 2×1028620881² = 2116121833658432322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1028620871) 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, 18925 + ... + 49146.

It is an arithmetic number, because the mean of its divisors is an integer number (65485264).

Almost surely, 2^1028620881 is an apocalyptic number.

It is an amenable number.

1028620881 is a deficient number, since it is larger than the sum of its proper divisors (543025455).

1028620881 is a wasteful number, since it uses less digits than its factorization.

1028620881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68173 (or 68170 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 36.

The square root of 1028620881 is about 32072.1199954103. The cubic root of 1028620881 is about 1009.4506966347.

The spelling of 1028620881 in words is "one billion, twenty-eight million, six hundred twenty thousand, eight hundred eighty-one".