87928019 has 2 divisors, whose sum is σ = 87928020. Its totient is φ = 87928018.

The previous prime is 87928013. The next prime is 87928031. The reversal of 87928019 is 91082978.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87928019 - 2¹² = 87923923 is a prime.

It is a super-2 number, since 2×87928019² = 15462673050528722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87928013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43964009 + 43964010.

It is an arithmetic number, because the mean of its divisors is an integer number (43964010).

Almost surely, 2^87928019 is an apocalyptic number.

87928019 is a deficient number, since it is larger than the sum of its proper divisors (1).

87928019 is an equidigital number, since it uses as much as digits as its factorization.

87928019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 44.

The square root of 87928019 is about 9376.9941345828. The cubic root of 87928019 is about 444.6747090392.

The spelling of 87928019 in words is "eighty-seven million, nine hundred twenty-eight thousand, nineteen".