987640571 has 8 divisors (see below), whose sum is σ = 999924288. Its totient is φ = 975429000.

The previous prime is 987640567. The next prime is 987640583. The reversal of 987640571 is 175046789.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 987640571 - 2² = 987640567 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (987640561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9776 + ... + 45506.

It is an arithmetic number, because the mean of its divisors is an integer number (124990536).

Almost surely, 2^987640571 is an apocalyptic number.

987640571 is a deficient number, since it is larger than the sum of its proper divisors (12283717).

987640571 is a wasteful number, since it uses less digits than its factorization.

987640571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36073.

The product of its (nonzero) digits is 423360, while the sum is 47.

The square root of 987640571 is about 31426.7492910100. The cubic root of 987640571 is about 995.8630999912.

The spelling of 987640571 in words is "nine hundred eighty-seven million, six hundred forty thousand, five hundred seventy-one".