9987764602 has 4 divisors (see below), whose sum is σ = 14981646906. Its totient is φ = 4993882300.

The previous prime is 9987764569. The next prime is 9987764603. The reversal of 9987764602 is 2064677899.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2064677899 = 47 ⋅43929317.

It can be written as a sum of positive squares in only one way, i.e., 5318639041 + 4669125561 = 72929^2 + 68331^2 .

It is not an unprimeable number, because it can be changed into a prime (9987764603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2496941149 + ... + 2496941152.

Almost surely, 2^9987764602 is an apocalyptic number.

9987764602 is a deficient number, since it is larger than the sum of its proper divisors (4993882304).

9987764602 is a wasteful number, since it uses less digits than its factorization.

9987764602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4993882303.

The product of its (nonzero) digits is 9144576, while the sum is 58.

The square root of 9987764602 is about 99938.8042854226. The cubic root of 9987764602 is about 2153.5556525586. Note that the first 3 decimals are identical.

The spelling of 9987764602 in words is "nine billion, nine hundred eighty-seven million, seven hundred sixty-four thousand, six hundred two".