1028620987 has 2 divisors, whose sum is σ = 1028620988. Its totient is φ = 1028620986.

The previous prime is 1028620963. The next prime is 1028621003. The reversal of 1028620987 is 7890268201.

It is a strong prime.

It is an emirp because it is prime and its reverse (7890268201) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1028620987 is a prime.

It is a super-2 number, since 2×1028620987² = 2116122269793708338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1028620907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 514310493 + 514310494.

It is an arithmetic number, because the mean of its divisors is an integer number (514310494).

Almost surely, 2^1028620987 is an apocalyptic number.

1028620987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1028620987 is an equidigital number, since it uses as much as digits as its factorization.

1028620987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 1028620987 is about 32072.1216479359. The cubic root of 1028620987 is about 1009.4507313095.

The spelling of 1028620987 in words is "one billion, twenty-eight million, six hundred twenty thousand, nine hundred eighty-seven".