87013509 has 8 divisors (see below), whose sum is σ = 126565152. Its totient is φ = 52735440.

The previous prime is 87013499. The next prime is 87013519. The reversal of 87013509 is 90531078.

It is an interprime number because it is at equal distance from previous prime (87013499) and next prime (87013519).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 87013509 - 2⁹ = 87012997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 2636773 = 87013509 / (8 + 7 + 0 + 1 + 3 + 5 + 0 + 9).

It is a self number, because there is not a number n which added to its sum of digits gives 87013509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87013519) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1318354 + ... + 1318419.

It is an arithmetic number, because the mean of its divisors is an integer number (15820644).

Almost surely, 2^87013509 is an apocalyptic number.

It is an amenable number.

87013509 is a deficient number, since it is larger than the sum of its proper divisors (39551643).

87013509 is a wasteful number, since it uses less digits than its factorization.

87013509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2636787.

The product of its (nonzero) digits is 7560, while the sum is 33.

The square root of 87013509 is about 9328.1031833916. The cubic root of 87013509 is about 443.1276954737.

The spelling of 87013509 in words is "eighty-seven million, thirteen thousand, five hundred nine".