88021789 has 2 divisors, whose sum is σ = 88021790. Its totient is φ = 88021788.

The previous prime is 88021771. The next prime is 88021799. The reversal of 88021789 is 98712088.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76912900 + 11108889 = 8770^2 + 3333^2 .

It is a cyclic number.

It is not a de Polignac number, because 88021789 - 2⁹ = 88021277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (88021799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44010894 + 44010895.

It is an arithmetic number, because the mean of its divisors is an integer number (44010895).

Almost surely, 2^88021789 is an apocalyptic number.

It is an amenable number.

88021789 is a deficient number, since it is larger than the sum of its proper divisors (1).

88021789 is an equidigital number, since it uses as much as digits as its factorization.

88021789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 43.

The square root of 88021789 is about 9381.9928053692. The cubic root of 88021789 is about 444.8327259194.

The spelling of 88021789 in words is "eighty-eight million, twenty-one thousand, seven hundred eighty-nine".