87019729 has 4 divisors (see below), whose sum is σ = 87410176. Its totient is φ = 86629284.

The previous prime is 87019727. The next prime is 87019747. The reversal of 87019729 is 92791078.

It is a happy number.

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: 92791078 = 2 ⋅46395539.

It is a cyclic number.

It is not a de Polignac number, because 87019729 - 2¹ = 87019727 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87019721) 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, 194889 + ... + 195334.

It is an arithmetic number, because the mean of its divisors is an integer number (21852544).

Almost surely, 2^87019729 is an apocalyptic number.

It is an amenable number.

87019729 is a deficient number, since it is larger than the sum of its proper divisors (390447).

87019729 is a wasteful number, since it uses less digits than its factorization.

87019729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390446.

The product of its (nonzero) digits is 63504, while the sum is 43.

The square root of 87019729 is about 9328.4365785484. The cubic root of 87019729 is about 443.1382539438.

The spelling of 87019729 in words is "eighty-seven million, nineteen thousand, seven hundred twenty-nine".