87678971 has 2 divisors, whose sum is σ = 87678972. Its totient is φ = 87678970.

The previous prime is 87678961. The next prime is 87678991. The reversal of 87678971 is 17987678.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87678971 is a prime.

It is not a weakly prime, because it can be changed into another prime (87678931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43839485 + 43839486.

It is an arithmetic number, because the mean of its divisors is an integer number (43839486).

Almost surely, 2^87678971 is an apocalyptic number.

87678971 is a deficient number, since it is larger than the sum of its proper divisors (1).

87678971 is an equidigital number, since it uses as much as digits as its factorization.

87678971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1185408, while the sum is 53.

The square root of 87678971 is about 9363.7049825376. The cubic root of 87678971 is about 444.2544786746.

The spelling of 87678971 in words is "eighty-seven million, six hundred seventy-eight thousand, nine hundred seventy-one".