997628087 has 2 divisors, whose sum is σ = 997628088. Its totient is φ = 997628086.

The previous prime is 997628069. The next prime is 997628111. The reversal of 997628087 is 780826799.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 997628087 - 2²⁶ = 930519223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997628287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498814043 + 498814044.

It is an arithmetic number, because the mean of its divisors is an integer number (498814044).

Almost surely, 2^997628087 is an apocalyptic number.

997628087 is a deficient number, since it is larger than the sum of its proper divisors (1).

997628087 is an equidigital number, since it uses as much as digits as its factorization.

997628087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3048192, while the sum is 56.

The square root of 997628087 is about 31585.2510992077. The cubic root of 997628087 is about 999.2087364004.

The spelling of 997628087 in words is "nine hundred ninety-seven million, six hundred twenty-eight thousand, eighty-seven".