87729123 has 4 divisors (see below), whose sum is σ = 116972168. Its totient is φ = 58486080.

The previous prime is 87729113. The next prime is 87729127. The reversal of 87729123 is 32192778.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 87729123 - 2⁸ = 87728867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87729127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14621518 + ... + 14621523.

It is an arithmetic number, because the mean of its divisors is an integer number (29243042).

Almost surely, 2^87729123 is an apocalyptic number.

87729123 is a deficient number, since it is larger than the sum of its proper divisors (29243045).

87729123 is a wasteful number, since it uses less digits than its factorization.

87729123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29243044.

The product of its digits is 42336, while the sum is 39.

The square root of 87729123 is about 9366.3825994884. The cubic root of 87729123 is about 444.3391664230.

The spelling of 87729123 in words is "eighty-seven million, seven hundred twenty-nine thousand, one hundred twenty-three".