87798987 has 12 divisors (see below), whose sum is σ = 127042344. Its totient is φ = 58430400.

The previous prime is 87798983. The next prime is 87798989. The reversal of 87798987 is 78989778.

It is not a de Polignac number, because 87798987 - 2² = 87798983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87798983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2889 + ... + 13562.

It is an arithmetic number, because the mean of its divisors is an integer number (10586862).

Almost surely, 2^87798987 is an apocalyptic number.

87798987 is a deficient number, since it is larger than the sum of its proper divisors (39243357).

87798987 is a wasteful number, since it uses less digits than its factorization.

87798987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17050 (or 17047 counting only the distinct ones).

The product of its digits is 14224896, while the sum is 63.

The square root of 87798987 is about 9370.1113654001. Note that the first 3 decimals coincide. The cubic root of 87798987 is about 444.4570864992.

It can be divided in two parts, 8779 and 8987, that added together give a triangular number (17766 = T₁₈₈).

The spelling of 87798987 in words is "eighty-seven million, seven hundred ninety-eight thousand, nine hundred eighty-seven".