87729831 has 32 divisors (see below), whose sum is σ = 149112320. Its totient is φ = 49937472.

The previous prime is 87729799. The next prime is 87729839. The reversal of 87729831 is 13892778.

It is not a de Polignac number, because 87729831 - 2⁵ = 87729799 is a prime.

It is a super-2 number, since 2×87729831² = 15393046494577122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87729839) 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, 58416 + ... + 59898.

It is an arithmetic number, because the mean of its divisors is an integer number (4659760).

Almost surely, 2^87729831 is an apocalyptic number.

87729831 is a deficient number, since it is larger than the sum of its proper divisors (61382489).

87729831 is a wasteful number, since it uses less digits than its factorization.

87729831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1812 (or 1806 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 87729831 is about 9366.4203941527. The cubic root of 87729831 is about 444.3403617360.

The spelling of 87729831 in words is "eighty-seven million, seven hundred twenty-nine thousand, eight hundred thirty-one".