87015779 has 2 divisors, whose sum is σ = 87015780. Its totient is φ = 87015778.

The previous prime is 87015769. The next prime is 87015827. The reversal of 87015779 is 97751078.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87015779 - 2¹⁶ = 86950243 is a prime.

It is not a weakly prime, because it can be changed into another prime (87015769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43507889 + 43507890.

It is an arithmetic number, because the mean of its divisors is an integer number (43507890).

Almost surely, 2^87015779 is an apocalyptic number.

87015779 is a deficient number, since it is larger than the sum of its proper divisors (1).

87015779 is an equidigital number, since it uses as much as digits as its factorization.

87015779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 123480, while the sum is 44.

The square root of 87015779 is about 9328.2248579245. The cubic root of 87015779 is about 443.1315488644.

The spelling of 87015779 in words is "eighty-seven million, fifteen thousand, seven hundred seventy-nine".