87798138 has 64 divisors (see below), whose sum is σ = 192568320. Its totient is φ = 26611200.

The previous prime is 87798133. The next prime is 87798163. The reversal of 87798138 is 83189778.

It is not an unprimeable number, because it can be changed into a prime (87798133) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 220956 + ... + 221352.

It is an arithmetic number, because the mean of its divisors is an integer number (3008880).

Almost surely, 2^87798138 is an apocalyptic number.

87798138 is an abundant number, since it is smaller than the sum of its proper divisors (104770182).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

87798138 is a wasteful number, since it uses less digits than its factorization.

87798138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503.

The product of its digits is 677376, while the sum is 51.

The square root of 87798138 is about 9370.0660616668. The cubic root of 87798138 is about 444.4556538886.

The spelling of 87798138 in words is "eighty-seven million, seven hundred ninety-eight thousand, one hundred thirty-eight".