987790775 has 24 divisors (see below), whose sum is σ = 1305345024. Its totient is φ = 739772000.

The previous prime is 987790757. The next prime is 987790847. The reversal of 987790775 is 577097789.

987790775 = T₈₈₇₇ + T₈₈₇₈ + ... + T₈₉₀₁.

It is not a de Polignac number, because 987790775 - 2¹⁴ = 987774391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8750 + ... + 45300.

It is an arithmetic number, because the mean of its divisors is an integer number (54389376).

Almost surely, 2^987790775 is an apocalyptic number.

987790775 is a deficient number, since it is larger than the sum of its proper divisors (317554249).

987790775 is a wasteful number, since it uses less digits than its factorization.

987790775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36631 (or 36626 counting only the distinct ones).

The product of its (nonzero) digits is 7779240, while the sum is 59.

The square root of 987790775 is about 31429.1389477981. The cubic root of 987790775 is about 995.9135822696.

The spelling of 987790775 in words is "nine hundred eighty-seven million, seven hundred ninety thousand, seven hundred seventy-five".