87678949 has 2 divisors, whose sum is σ = 87678950. Its totient is φ = 87678948.

The previous prime is 87678931. The next prime is 87678953. The reversal of 87678949 is 94987678.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62125924 + 25553025 = 7882^2 + 5055^2 .

It is a cyclic number.

It is not a de Polignac number, because 87678949 - 2⁷ = 87678821 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 87678893 and 87678902.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87678449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43839474 + 43839475.

It is an arithmetic number, because the mean of its divisors is an integer number (43839475).

Almost surely, 2^87678949 is an apocalyptic number.

It is an amenable number.

87678949 is a deficient number, since it is larger than the sum of its proper divisors (1).

87678949 is an equidigital number, since it uses as much as digits as its factorization.

87678949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6096384, while the sum is 58.

The square root of 87678949 is about 9363.7038077889. The cubic root of 87678949 is about 444.2544415179.

The spelling of 87678949 in words is "eighty-seven million, six hundred seventy-eight thousand, nine hundred forty-nine".