87078491 has 2 divisors, whose sum is σ = 87078492. Its totient is φ = 87078490.

The previous prime is 87078479. The next prime is 87078517. The reversal of 87078491 is 19487078.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87078491 - 2¹⁰ = 87077467 is a prime.

It is not a weakly prime, because it can be changed into another prime (87078421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43539245 + 43539246.

It is an arithmetic number, because the mean of its divisors is an integer number (43539246).

Almost surely, 2^87078491 is an apocalyptic number.

87078491 is a deficient number, since it is larger than the sum of its proper divisors (1).

87078491 is an equidigital number, since it uses as much as digits as its factorization.

87078491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112896, while the sum is 44.

The square root of 87078491 is about 9331.5856637551. The cubic root of 87078491 is about 443.2379778083.

The spelling of 87078491 in words is "eighty-seven million, seventy-eight thousand, four hundred ninety-one".