87402089 has 2 divisors, whose sum is σ = 87402090. Its totient is φ = 87402088.

The previous prime is 87402079. The next prime is 87402127. The reversal of 87402089 is 98020478.

It is an a-pointer prime, because the next prime (87402127) can be obtained adding 87402089 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86118400 + 1283689 = 9280^2 + 1133^2 .

It is a cyclic number.

It is not a de Polignac number, because 87402089 - 2¹² = 87397993 is a prime.

It is not a weakly prime, because it can be changed into another prime (87402079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43701044 + 43701045.

It is an arithmetic number, because the mean of its divisors is an integer number (43701045).

Almost surely, 2^87402089 is an apocalyptic number.

It is an amenable number.

87402089 is a deficient number, since it is larger than the sum of its proper divisors (1).

87402089 is an equidigital number, since it uses as much as digits as its factorization.

87402089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 87402089 is about 9348.9084389569. The cubic root of 87402089 is about 443.7863475087.

The spelling of 87402089 in words is "eighty-seven million, four hundred two thousand, eighty-nine".