987770771 has 16 divisors (see below), whose sum is σ = 1127708064. Its totient is φ = 857101824.

The previous prime is 987770761. The next prime is 987770779. The reversal of 987770771 is 177077789.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-987770771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (987770779) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 218096 + ... + 222578.

It is an arithmetic number, because the mean of its divisors is an integer number (70481754).

Almost surely, 2^987770771 is an apocalyptic number.

987770771 is a deficient number, since it is larger than the sum of its proper divisors (139937293).

987770771 is a wasteful number, since it uses less digits than its factorization.

987770771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5510.

The product of its (nonzero) digits is 1210104, while the sum is 53.

The square root of 987770771 is about 31428.8207064789. The cubic root of 987770771 is about 995.9068593918.

The spelling of 987770771 in words is "nine hundred eighty-seven million, seven hundred seventy thousand, seven hundred seventy-one".