87420871 has 2 divisors, whose sum is σ = 87420872. Its totient is φ = 87420870.

The previous prime is 87420857. The next prime is 87420911. The reversal of 87420871 is 17802478.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87420871 - 2⁷ = 87420743 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87420871.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87420811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43710435 + 43710436.

It is an arithmetic number, because the mean of its divisors is an integer number (43710436).

Almost surely, 2^87420871 is an apocalyptic number.

87420871 is a deficient number, since it is larger than the sum of its proper divisors (1).

87420871 is an equidigital number, since it uses as much as digits as its factorization.

87420871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25088, while the sum is 37.

The square root of 87420871 is about 9349.9128872947. The cubic root of 87420871 is about 443.8181339274.

The spelling of 87420871 in words is "eighty-seven million, four hundred twenty thousand, eight hundred seventy-one".