987578819 has 2 divisors, whose sum is σ = 987578820. Its totient is φ = 987578818.

The previous prime is 987578791. The next prime is 987578843. The reversal of 987578819 is 918875789.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-987578819 is a prime.

It is a super-2 number, since 2×987578819² = 1950623847474869522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (987578869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493789409 + 493789410.

It is an arithmetic number, because the mean of its divisors is an integer number (493789410).

Almost surely, 2^987578819 is an apocalyptic number.

987578819 is a deficient number, since it is larger than the sum of its proper divisors (1).

987578819 is an equidigital number, since it uses as much as digits as its factorization.

987578819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10160640, while the sum is 62.

The square root of 987578819 is about 31425.7668005094. The cubic root of 987578819 is about 995.8423441880.

The spelling of 987578819 in words is "nine hundred eighty-seven million, five hundred seventy-eight thousand, eight hundred nineteen".