987090723 has 24 divisors (see below), whose sum is σ = 1446316560. Its totient is φ = 648637440.

The previous prime is 987090691. The next prime is 987090733. The reversal of 987090723 is 327090789.

It is a Cunningham number, because it is equal to 31418²-1.

It is not a de Polignac number, because 987090723 - 2⁵ = 987090691 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (987090733) 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, 281008 + ... + 284498.

It is an arithmetic number, because the mean of its divisors is an integer number (60263190).

Almost surely, 2^987090723 is an apocalyptic number.

987090723 is a deficient number, since it is larger than the sum of its proper divisors (459225837).

987090723 is a wasteful number, since it uses less digits than its factorization.

987090723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3939 (or 3936 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 45.

The square root of 987090723 is about 31417.9999840856. Note that the first 4 decimals coincide. The cubic root of 987090723 is about 995.6782571115.

The spelling of 987090723 in words is "nine hundred eighty-seven million, ninety thousand, seven hundred twenty-three".