87157729 has 4 divisors (see below), whose sum is σ = 87395584. Its totient is φ = 86919876.

The previous prime is 87157727. The next prime is 87157739. The reversal of 87157729 is 92775178.

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, and also an emirpimes, since its reverse is a distinct semiprime: 92775178 = 2 ⋅46387589.

It is a cyclic number.

It is not a de Polignac number, because 87157729 - 2¹ = 87157727 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87157723) 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, 118377 + ... + 119110.

It is an arithmetic number, because the mean of its divisors is an integer number (21848896).

Almost surely, 2^87157729 is an apocalyptic number.

It is an amenable number.

87157729 is a deficient number, since it is larger than the sum of its proper divisors (237855).

87157729 is a wasteful number, since it uses less digits than its factorization.

87157729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237854.

The product of its digits is 246960, while the sum is 46.

The square root of 87157729 is about 9335.8303862056. The cubic root of 87157729 is about 443.3723800886.

The spelling of 87157729 in words is "eighty-seven million, one hundred fifty-seven thousand, seven hundred twenty-nine".