87912729 has 16 divisors (see below), whose sum is σ = 137903040. Its totient is φ = 55160640.

The previous prime is 87912709. The next prime is 87912731. The reversal of 87912729 is 92721978.

It is not a de Polignac number, because 87912729 - 2²¹ = 85815577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87912709) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95307 + ... + 96224.

It is an arithmetic number, because the mean of its divisors is an integer number (8618940).

Almost surely, 2^87912729 is an apocalyptic number.

It is an amenable number.

87912729 is a deficient number, since it is larger than the sum of its proper divisors (49990311).

87912729 is a wasteful number, since it uses less digits than its factorization.

87912729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191557 (or 191551 counting only the distinct ones).

The product of its digits is 127008, while the sum is 45.

The square root of 87912729 is about 9376.1788058889. The cubic root of 87912729 is about 444.6489323849.

Subtracting 87912729 from its reverse (92721978), we obtain a square (4809249 = 2193²).

The spelling of 87912729 in words is "eighty-seven million, nine hundred twelve thousand, seven hundred twenty-nine".