87129429 has 4 divisors (see below), whose sum is σ = 116172576. Its totient is φ = 58086284.

The previous prime is 87129409. The next prime is 87129431. The reversal of 87129429 is 92492178.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 87129429 - 2⁹ = 87128917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87129409) 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, 14521569 + ... + 14521574.

It is an arithmetic number, because the mean of its divisors is an integer number (29043144).

Almost surely, 2^87129429 is an apocalyptic number.

It is an amenable number.

87129429 is a deficient number, since it is larger than the sum of its proper divisors (29043147).

87129429 is a wasteful number, since it uses less digits than its factorization.

87129429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29043146.

The product of its digits is 72576, while the sum is 42.

The square root of 87129429 is about 9334.3145972267. The cubic root of 87129429 is about 443.3243874176.

The spelling of 87129429 in words is "eighty-seven million, one hundred twenty-nine thousand, four hundred twenty-nine".