87750239 has 2 divisors, whose sum is σ = 87750240. Its totient is φ = 87750238.

The previous prime is 87750217. The next prime is 87750319. The reversal of 87750239 is 93205778.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87750239 - 2²⁰ = 86701663 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 87750196 and 87750205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87750539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43875119 + 43875120.

It is an arithmetic number, because the mean of its divisors is an integer number (43875120).

Almost surely, 2^87750239 is an apocalyptic number.

87750239 is a deficient number, since it is larger than the sum of its proper divisors (1).

87750239 is an equidigital number, since it uses as much as digits as its factorization.

87750239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 105840, while the sum is 41.

The square root of 87750239 is about 9367.5097544652. The cubic root of 87750239 is about 444.3748137004.

The spelling of 87750239 in words is "eighty-seven million, seven hundred fifty thousand, two hundred thirty-nine".