987147775 has 24 divisors (see below), whose sum is σ = 1283136624. Its totient is φ = 752505600.

The previous prime is 987147767. The next prime is 987147779. The reversal of 987147775 is 577741789.

It is a happy number.

It is not a de Polignac number, because 987147775 - 2³ = 987147767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987147779) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32877 + ... + 55273.

It is an arithmetic number, because the mean of its divisors is an integer number (53464026).

Almost surely, 2^987147775 is an apocalyptic number.

987147775 is a deficient number, since it is larger than the sum of its proper divisors (295988849).

987147775 is a wasteful number, since it uses less digits than its factorization.

987147775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22491 (or 22486 counting only the distinct ones).

The product of its digits is 3457440, while the sum is 55.

The square root of 987147775 is about 31418.9079218231. The cubic root of 987147775 is about 995.6974395230.

The spelling of 987147775 in words is "nine hundred eighty-seven million, one hundred forty-seven thousand, seven hundred seventy-five".